multi-monitors-add-on
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Calendar not displayed properly on other monitors
The calendar background is transparent on monitors other than primary. GNOME version is 3.36.8
Here are the pictures showing the issue:

I have the same problem. (Pop!_OS 20.04 LTS) Gnome Version: 3.36.8

And it's happening a bug with the windows when I go to overview

Same problem: Ubuntu 20.04.2 LTS, GNOME Shell 3.36.7, Multi Monitors Add-On version 21
I've managed to make it work by setting width of datemenu-calendar-column to 320px. I'm just not sure how will this work on other resolutions, but it worked fine on few that I tested.
For people that want quick fix and have no idea what I just said, add following to the end of ~/.local/share/gnome-shell/extensions/multi-monitors-add-on@spin83/stylesheet.css:
.datemenu-calendar-column {
width: 320px;
}
After that you'll need to restart GNOME shell, by pressing ALT+F2, input r and press ENTER.
If size is not working with your resolution try to increase/decrease it.
Thanks! It worked for me!
this trick with css style for calendar works fine for me!
This fix worked for me Ubuntu 20.04.5 LTS - Gnome Version 3.36.8
The CSS trick also worked for me (Ubuntu 20.04.6 LTS and GNOME 3.36.8). Commenting so I can find this fix again later, if need be.