Dropdown button in categorized symbology does not work on MacOS

[tomasMizera]

What is the bug or the crash?

The advanced dropdown button in Categorized layer symbology settings does not work on macOS. As shown in the attached video, the dropdown appears to not receive focus, preventing any option in the dropdown menu from being clicked. The system plays the alert "boop" sound when trying to click on any option.

macos-bug-failing.mp4

Interestingly, this issue does not occur with all similar buttons. For example, the advanced button in Single symbol symbology works as expected:

macos-bug-working.mp4

I am not aware of other places where this button does not work. I'll add them here if I come across this again.

Steps to reproduce the issue

1. Right-click on layer in the layer tree
2. Choose Properties
3. Go to Symbology tab
4. Choose Categorized symbology
5. Click the advanced menu in the middle right of the screen
6. You won't be able to click on any of the dropdown options

Versions

QGIS version	3.42.0-Münster
QGIS code revision	8f66da66788
Libraries
Qt version	5.15.2
Python version	3.9.5
GDAL version	3.3.2
PROJ version	8.1.1
EPSG Registry database version	v10.028 (2021-07-07)
GEOS version	3.9.1-CAPI-1.14.2
SQLite version	3.35.2
PDAL version	2.3.0
PostgreSQL client version	12.3
SpatiaLite version	5.0.1
QWT version	6.1.6
QScintilla2 version	2.11.5
OS version	macOS 15.3
Active Python plugins
qgis2web	3.25.1
plugin_reloader	0.17
processing	2.12.99
grassprovider	2.12.99
db_manager	0.1.20
MetaSearch	0.3.6
Mergin	2025.1.1

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

This is M2 Macbook Pro.

[DelazJ]

4. Choose Categorized symbology

5. Click the advanced menu in the middle right of the screen

@tomasMizera does it also occur if you actually set a categorized symbology, I.e. select a field and apply, before you try the drop-down entries?

[tomasMizera]

@tomasMizera does it also occur if you actually set a categorized symbology, I.e. select a field and apply, before you try the drop-down entries?

Hi @DelazJ, thanks for your comment, I tried multiple scenarios, no luck. See:

qgis-bug-2.mp4