can you ensure plugin, server and browser caches are cleared.
If the issue persists can you try opening a different browser. There is a chance there are left over temporary or local store files on the browser causing the issue.
Hi David, thank you!
And sorry for the double-post, it wasn’t on purpose.
Problem is solved: Ut was a plugin called “Image Source Control”. It’s now deactivated and the layout-options are usable (still in the editor column). 🙂