Does anyone have a solution?
Update your software.
I am using (Cloud) version 21.2.56.
Is this not the latest? If so, how to obtain the latest version?
This is a bug.
I assumed you were behind on updates, @ries, because your screen looked different.
Next time I will include the version number in the screenshot.
The golden rule still remains: The better the question, the better the answer. 
Fixed in the latest version (21.2.58). If you want to force the upgrade on cloud edition, click Restart Cloud Server button at https://cloud.manager.io
@lubos, many thanks for your very swift response!