The "Calendar Properties" Item in the TB Edit-Menu is always enabled if one o the calendar tabs is in foreground. even if the calendar list is hidden. Expected: Should only be enabled, when a calendar in the calendar list has focus. Could maybe also be solved by allowing calendar-list to have no selection. Currently one calendar is always selected.

Not sure we should really inhibit this. A possible use case for hiding the calendar list is that you only have one calendar anyway. In that case, you still want to view your calendar properties without showing the list. Special casing for just one calendar and only when the calendar list is not shown could get complicated and not worth the effort. What do you think?

After having not looked at this for a while and trying the behaviour again, I agree with comment #1. One gets to see the calendar name anyway in the edit dialog. And as no one else commented, the work seems indeed not worth the effort. Setting this one WONTFIX