Hi all,
No, Apple Photos don't loose focus. But for instance if I am in Affinity Monochrome and click on the control for Red, then this control are the only one that I can move. And after the first click, I can move the slider even if I have the cursor at the bottom of the window and clicking. But there will be no changes after the first click.
It happens to other extensions too and also for extensions from Macphun.
I haven't try another user account, I am the only user.
I can see the "Cancel" and & "Save Changes" button at the top, so that isn't the problem. But it seems as they are looked until I switches back and forward to another application.