I’ve hit a known bug here:
#3660 - “Remove impossible actions from entries in the main dialog. For example: Share button on deleted files.” On Win10 2004, I have both a share button and a ‘View activity’ button on every notification entry, whether they make sense or not. This includes Deck card update and sync ‘file ignored’ notifications.
Also, a maybe-not-known bug with positioning of one of the dialog boxes:
It looks like the ‘File activity’ details dialog is set to center on the Nextcloud app’s main window location, but it is wider than that window. This becomes an issue if your Windows task-bar is docked to one side of the screen, rather than the bottom. You can see part of my task-bar in this window-capture screenshot, which demonstrates the overlap:
Note: the dialog is blank because of #3660, not this bug.
Note again: This is definitely not #3443, which is about positioning of the main window. The main window positioned correctly here, just not this other dialog.