Created attachment 124089 [details]
Video of the issue.
The comboboxes change their size after selecting an item in line with the length of the text of this item.
That means if an item with a short text was chosen first, the combobox becomes small. If there are items with longer texts,
they all get cut off with "...".
STEPS TO REPRODUCE
Operating System: Manjaro Linux
KDE Plasma Version: 5.17.3
KDE Frameworks Version: 5.65.0
Qt Version: 5.13.2
*** This bug has been marked as a duplicate of bug 403153 ***