SUMMARY
'System Settings' doesn't resize the correct navigation when it's resized from the right side of the window.

STEPS TO REPRODUCE
1. Open 'System Settings' and make sure that the width value is minimum admited one.
2. Open a setting option that has multiple options (like Keyboard Shortcuts)
3. Using a window handle, increase the width until the kirigami framework choses a layout where it displays both navigation panels.
3. Using the right window handle, decrease the width until the kirigami framework should display the layout where only the settings options are displayed.

OBSERVED RESULT
The main settings navigation panel is being displayed.

EXPECTED RESULT
The layout where only the settings options should have been displayed.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.14.90
KDE Plasma Version: 5.14.90
KDE Frameworks Version: 5.54.0
Qt Version: 5.12.0-3

ADDITIONAL INFORMATION
If the window is resized from the bottom-right handle, the correct navigation will be displayed.