Calendar pop-up disappears when focus is lost
When I click on the datetime applet, the calendar pop-up is displayed. I want for example to display the next month, so I click on the [>] buutton in the pop-up window. But as soon as I move the cursour outside (e.g. to start typing), the pop-up window disappears. I want it to be displayed permanently, until I click on the applet again. I use the "follow mouse" focus in my desktop.
This is Fedora 34, xfce4-datetime-plugin-0.8.1-2.fc34.x86_64.