diff --git a/src/sidebarApps/files/style.scss b/src/sidebarApps/files/style.scss
index 906d1d647..4b3a8b7fa 100644
--- a/src/sidebarApps/files/style.scss
+++ b/src/sidebarApps/files/style.scss
@@ -64,6 +64,13 @@
     }
   }
 
+  > .list > .tile[data-type="root"] > .text {
+    min-width: 0;
+    width: auto !important;
+    overflow: hidden !important;
+    text-overflow: ellipsis !important;
+  }
+
   /* Add indent guides for folders (excluding first level) */
   .list.collapsible > ul > .collapsible > ul {
     position: relative;
diff --git a/tests/unit/fileSidebarStyles.test.js b/tests/unit/fileSidebarStyles.test.js
new file mode 100644
index 000000000..3f0f39046
--- /dev/null
+++ b/tests/unit/fileSidebarStyles.test.js
@@ -0,0 +1,58 @@
+import { fileURLToPath } from "node:url";
+import { Window } from "happy-dom";
+import * as sass from "sass";
+import { describe, expect, it } from "vitest";
+
+const stylesheetPath = fileURLToPath(
+	new URL("../../src/sidebarApps/files/style.scss", import.meta.url),
+);
+
+function renderFileTreeStyles() {
+	const window = new Window();
+	const { document } = window;
+	const style = document.createElement("style");
+
+	style.textContent = sass.compile(stylesheetPath).css;
+	document.head.append(style);
+	document.body.innerHTML = `
+		<div class="container files">
+			<div class="list collapsible">
+				<div class="tile" data-type="root">
+					<span class="text" id="root-folder-name">
+						A-VERY-LONG-ROOT-FOLDER-NAME
+					</span>
+				</div>
+				<ul class="file-tree">
+					<li class="tile" data-type="file">
+						<span class="text" id="nested-file-name">
+							A-VERY-LONG-NESTED-FILE-NAME.js
+						</span>
+					</li>
+				</ul>
+			</div>
+		</div>
+	`;
+
+	return { document, window };
+}
+
+describe("file sidebar label overflow", () => {
+	it("truncates root folder names without changing nested row scrolling", () => {
+		const { document, window } = renderFileTreeStyles();
+		const rootStyles = window.getComputedStyle(
+			document.getElementById("root-folder-name"),
+		);
+		const nestedStyles = window.getComputedStyle(
+			document.getElementById("nested-file-name"),
+		);
+
+		expect(rootStyles.minWidth).toBe("0");
+		expect(rootStyles.width).toBe("auto");
+		expect(rootStyles.overflow).toBe("hidden");
+		expect(rootStyles.textOverflow).toBe("ellipsis");
+
+		expect(nestedStyles.width).toBe("max-content");
+		expect(nestedStyles.overflow).toBe("visible");
+		expect(nestedStyles.textOverflow).toBe("clip");
+	});
+});