SUMMARY
If I select any category that has sub-categories (e.g. Appearance) and the window is narrow enough that the top-level category list disappears then it is not possible to go back to the top level list

STEPS TO REPRODUCE
1. Launch System Settings
2. Select any category in the list on the right that has sub-categories (i.e. has a ">" )
3. Adjust the window width if necessary such that the top-level list is not shown
4. Attempt to go back to the top level list by clicking the heading of the sub-list

OBSERVED RESULT
Nothing happens

EXPECTED RESULT
Top-level list is displayed

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.23
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.88.0
Qt Version: 5.15.3
Kernel Version: 5.11.0-40-generic (64-bit)
Graphics Platform: Wayland
Processors: 2 × AMD A6-6400K APU with Radeon(tm) HD Graphics
Memory: 7.7 GiB of RAM
Graphics Processor: AMD CEDAR

ADDITIONAL INFORMATION
If I launch systemsettings from a terminal, the following is output every time I click the back button:

qt.quick.touch.target: QQuickTapHandler(0x55e89a052b40) pointId 0 is missing from current event, but was neither canceled nor released