diff --git a/src/NUnitTestAdapter/AdapterSettings.cs b/src/NUnitTestAdapter/AdapterSettings.cs
index 65cc94ce..188d674d 100644
--- a/src/NUnitTestAdapter/AdapterSettings.cs
+++ b/src/NUnitTestAdapter/AdapterSettings.cs
@@ -33,110 +33,6 @@
 
 namespace NUnit.VisualStudio.TestAdapter
 {
-    public interface IAdapterSettings
-    {
-        int MaxCpuCount { get; }
-        string ResultsDirectory { get; }
-        string TargetPlatform { get; }
-        string TargetFrameworkVersion { get; }
-        string TestAdapterPaths { get; }
-        bool CollectSourceInformation { get; }
-        IDictionary<string, string> TestProperties { get; }
-        InternalTraceLevel InternalTraceLevelEnum { get; }
-        string WorkDirectory { get; }
-        string Where { get; }
-        int DefaultTimeout { get; }
-        int NumberOfTestWorkers { get; }
-        bool ShadowCopyFiles { get; }
-        int Verbosity { get; }
-        bool UseVsKeepEngineRunning { get; }
-        string BasePath { get; }
-        string PrivateBinPath { get; }
-        int? RandomSeed { get; }
-        bool RandomSeedSpecified { get; }
-        bool InProcDataCollectorsAvailable { get; }
-        // ReSharper disable once UnusedMemberInSuper.Global
-        bool CollectDataForEachTestSeparately { get; }  // Used implicitly by MS
-        bool SynchronousEvents { get; }
-        string DomainUsage { get; }
-        bool DumpXmlTestDiscovery { get; }
-        bool DumpXmlTestResults { get; }
-
-        bool DumpVsInput { get; }
-
-        bool PreFilter { get; }
-
-        /// <summary>
-        ///  Syntax documentation <see cref="https://github.com/nunit/docs/wiki/Template-Based-Test-Naming"/>.
-        /// </summary>
-        string DefaultTestNamePattern { get; }
-
-        VsTestCategoryType VsTestCategoryType { get; }
-        string TestOutputXml { get; }
-        bool UseTestOutputXml { get; }
-        OutputXmlFolderMode OutputXmlFolderMode { get; }
-
-        /// <summary>
-        /// For retry runs create a new file for each run.
-        /// </summary>
-        bool NewOutputXmlFileForEachRun { get; }
-
-        /// <summary>
-        /// True if test run is triggered in an IDE/Editor context.
-        /// </summary>
-        bool DesignMode { get; }
-
-        /// <summary>
-        /// If true, an adapter shouldn't create appdomains to run tests.
-        /// </summary>
-        bool DisableAppDomain { get; }
-
-        /// <summary>
-        /// If true, an adapter should disable any test case parallelization.
-        /// </summary>
-        bool DisableParallelization { get; }
-
-        bool ShowInternalProperties { get; }
-
-        bool UseParentFQNForParametrizedTests { get; }
-
-        bool UseNUnitIdforTestCaseId { get; }
-
-        int ConsoleOut { get; }
-        bool StopOnError { get; }
-        TestOutcome MapWarningTo { get; }
-        bool UseTestNameInConsoleOutput { get; }
-        DisplayNameOptions DisplayName { get; }
-        char FullnameSeparator { get; }
-        DiscoveryMethod DiscoveryMethod { get; }
-        bool SkipNonTestAssemblies { get; }
-
-        int AssemblySelectLimit { get; }
-
-        bool UseNUnitFilter { get; }
-        bool IncludeStackTraceForSuites { get; }
-
-
-        void Load(IDiscoveryContext context, TestLogger testLogger = null);
-        void Load(string settingsXml);
-        void SaveRandomSeed(string dirname);
-        void RestoreRandomSeed(string dirname);
-
-        bool EnsureAttachmentFileScheme { get; }
-
-        // For Internal Development use
-        bool FreakMode { get; }  // displays metadata instead of real data in Test Explorer
-        bool Debug { get; }
-        bool DebugExecution { get; }
-        bool DebugDiscovery { get; }
-
-        // Filter control
-        ExplicitModeEnum ExplicitMode { get; }
-        bool SkipExecutionWhenNoTests { get; }
-        string TestOutputFolder { get; }
-        string SetTestOutputFolder(string workDirectory);
-    }
-
     public enum VsTestCategoryType
     {
         NUnit,
@@ -197,6 +93,8 @@ public AdapterSettings(ITestLogger logger)
         /// </summary>
         public bool DisableParallelization { get; private set; }
 
+        public bool AllowParallelWithDebugger { get; private set; }
+
         /// <summary>
         /// True if test run is triggered in an IDE/Editor context.
         /// </summary>
@@ -524,6 +422,7 @@ private void ExtractRunConfiguration(XmlDocument doc)
             CollectSourceInformation = GetInnerTextAsBool(runConfiguration, nameof(CollectSourceInformation), true);
             DisableAppDomain = GetInnerTextAsBool(runConfiguration, nameof(DisableAppDomain), false);
             DisableParallelization = GetInnerTextAsBool(runConfiguration, nameof(DisableParallelization), false);
+            AllowParallelWithDebugger = GetInnerTextAsBool(runConfiguration, nameof(AllowParallelWithDebugger), false);
             DesignMode = GetInnerTextAsBool(runConfiguration, nameof(DesignMode), false);
             CollectDataForEachTestSeparately =
                 GetInnerTextAsBool(runConfiguration, nameof(CollectDataForEachTestSeparately), false);
diff --git a/src/NUnitTestAdapter/IAdapterSettings.cs b/src/NUnitTestAdapter/IAdapterSettings.cs
new file mode 100644
index 00000000..8d8b116e
--- /dev/null
+++ b/src/NUnitTestAdapter/IAdapterSettings.cs
@@ -0,0 +1,118 @@
+using System.Collections.Generic;
+
+using Microsoft.VisualStudio.TestPlatform.ObjectModel;
+using Microsoft.VisualStudio.TestPlatform.ObjectModel.Adapter;
+
+using NUnit.Engine;
+
+namespace NUnit.VisualStudio.TestAdapter;
+
+public interface IAdapterSettings
+{
+    int MaxCpuCount { get; }
+    string ResultsDirectory { get; }
+    string TargetPlatform { get; }
+    string TargetFrameworkVersion { get; }
+    string TestAdapterPaths { get; }
+    bool CollectSourceInformation { get; }
+    IDictionary<string, string> TestProperties { get; }
+    InternalTraceLevel InternalTraceLevelEnum { get; }
+    string WorkDirectory { get; }
+    string Where { get; }
+    int DefaultTimeout { get; }
+    int NumberOfTestWorkers { get; }
+    bool ShadowCopyFiles { get; }
+    int Verbosity { get; }
+    bool UseVsKeepEngineRunning { get; }
+    string BasePath { get; }
+    string PrivateBinPath { get; }
+    int? RandomSeed { get; }
+    bool RandomSeedSpecified { get; }
+    bool InProcDataCollectorsAvailable { get; }
+    // ReSharper disable once UnusedMemberInSuper.Global
+    bool CollectDataForEachTestSeparately { get; }  // Used implicitly by MS
+    bool SynchronousEvents { get; }
+    string DomainUsage { get; }
+    bool DumpXmlTestDiscovery { get; }
+    bool DumpXmlTestResults { get; }
+
+    bool DumpVsInput { get; }
+
+    bool PreFilter { get; }
+
+    /// <summary>
+    ///  Syntax documentation <see cref="https://github.com/nunit/docs/wiki/Template-Based-Test-Naming"/>.
+    /// </summary>
+    string DefaultTestNamePattern { get; }
+
+    VsTestCategoryType VsTestCategoryType { get; }
+    string TestOutputXml { get; }
+    bool UseTestOutputXml { get; }
+    OutputXmlFolderMode OutputXmlFolderMode { get; }
+
+    /// <summary>
+    /// For retry runs create a new file for each run.
+    /// </summary>
+    bool NewOutputXmlFileForEachRun { get; }
+
+    /// <summary>
+    /// True if test run is triggered in an IDE/Editor context.
+    /// </summary>
+    bool DesignMode { get; }
+
+    /// <summary>
+    /// If true, an adapter shouldn't create appdomains to run tests.
+    /// </summary>
+    bool DisableAppDomain { get; }
+
+    /// <summary>
+    /// If true, an adapter should disable any test case parallelization.
+    /// </summary>
+    bool DisableParallelization { get; }
+
+    /// <summary>
+    /// Default is that when the adapter notice it is running with a debugger attached it will disable parallelization.
+    /// By changing this setting to `true` the adapter will allow parallelization even if a debugger is attached.
+    /// </summary>
+    bool AllowParallelWithDebugger { get; }
+
+    bool ShowInternalProperties { get; }
+
+    bool UseParentFQNForParametrizedTests { get; }
+
+    bool UseNUnitIdforTestCaseId { get; }
+
+    int ConsoleOut { get; }
+    bool StopOnError { get; }
+    TestOutcome MapWarningTo { get; }
+    bool UseTestNameInConsoleOutput { get; }
+    DisplayNameOptions DisplayName { get; }
+    char FullnameSeparator { get; }
+    DiscoveryMethod DiscoveryMethod { get; }
+    bool SkipNonTestAssemblies { get; }
+
+    int AssemblySelectLimit { get; }
+
+    bool UseNUnitFilter { get; }
+    bool IncludeStackTraceForSuites { get; }
+
+
+    void Load(IDiscoveryContext context, TestLogger testLogger = null);
+    void Load(string settingsXml);
+    void SaveRandomSeed(string dirname);
+    void RestoreRandomSeed(string dirname);
+
+    bool EnsureAttachmentFileScheme { get; }
+
+    // For Internal Development use
+    bool FreakMode { get; }  // displays metadata instead of real data in Test Explorer
+    bool Debug { get; }
+    bool DebugExecution { get; }
+    bool DebugDiscovery { get; }
+
+    // Filter control
+    ExplicitModeEnum ExplicitMode { get; }
+    bool SkipExecutionWhenNoTests { get; }
+    string TestOutputFolder { get; }
+    string SetTestOutputFolder(string workDirectory);
+}
\ No newline at end of file
diff --git a/src/NUnitTestAdapter/NUnitTestAdapter.cs b/src/NUnitTestAdapter/NUnitTestAdapter.cs
index ccea2855..4446d108 100644
--- a/src/NUnitTestAdapter/NUnitTestAdapter.cs
+++ b/src/NUnitTestAdapter/NUnitTestAdapter.cs
@@ -198,7 +198,7 @@ protected TestPackage CreateTestPackage(string assemblyName, IGrouping<string, T
                 TestLog.Debug("    Setting ShadowCopyFiles to true");
             }
 
-            if (Debugger.IsAttached)
+            if (Debugger.IsAttached && !Settings.AllowParallelWithDebugger)
             {
                 package.Settings[PackageSettings.NumberOfTestWorkers] = 0;
                 TestLog.Debug("    Setting NumberOfTestWorkers to zero for Debugging");