two CalDav calendars in one email account. Is there a way to show both calendars at the same time?

I have two CalDav calendars connected with one email account. Is there a way to show both calendars at the same time? The calendars show a checkbox, but only the one clicked shows up. So the checkboxes at like radio buttons

If you click on both check boxes, they will both be displayed.

Don’t click on the calendar name, rather click on the actual box.

I did, I clicked on the checkboxes. As I said, they behave as if they are radio buttons. So if I click the second, the check mark on the first disappears. As I said, it’s two CalDav calendars in one email account.

Ok, this is weird. Now, since I got a license, they act as expected. So it could be a behaviour you experience while you are in the trial period.

Unlikely. The trial period is an unrestricted version of eM Client, exactly the same as the Pro version.