I just discovered Kalendar due to a recommendation under a current bug in Korganizer. ;-) So I had a quick look through everything, using my two radicale calendars and contact birthdays.

Right in the first few moments I noticed an example of -- in my very humble opinion -- bad UI design: the details pane which wooshes in and out of the view. My reasoning is that it constantly rearranges the layout of the whole window, which is very distracting to the eye and confuses the user's orientation.

EXAMPLE
Consider the month view, and in it a day that has two events. I want to view the details of both of them. So I click on the first and while my eyes go off to read the details, my hand already moves the mouse to the next event automatically and blindly.

OBSERVED RESULT
The details pane, by moving into view, now squeezes the month view, which causes that next event to move away from the anticipated location.

EXPECTED RESULT
The main view layout should remain constant. When no event is selected, the pane may be left entirely empty, or get an empty-label, sort of like Dolphin does in empty directories. Something along the lines of "Select an event to show details here".

Thanks for your work and consideration.


SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3
Kernel Version: 5.17.4-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Celeron® N5100 @ 1.10GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics