Created attachment 145034 [details]
A screenshot of an active Elisa window. In the left, the category "Tracks" is selected but the albums are displayed instead. Both "Tracks" and "Albums" are circled red.

SUMMARY
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STEPS TO REPRODUCE
1. Open Elisa configuration (Ctrl+Shit+,)
2. Chose any category to embed
3. Apply and then change to default settings (no embed category)

OBSERVED RESULT
After reload the category embedded, it is pushed to the end of the columns but still behave as the default sidebar. (When clicking on Tracks, it goes to Albums; Files to Artists; etc)

EXPECTED RESULT
The name of the category should go back to its place.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.15.12
(available in About System)
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
If you keep changing categories they keep scrambled at the end of the sidebar.