⌘⇧H is assigned to the Home command by default in Chrome on macOS, so it’s too easy to accidentally trigger “Use as table headers,” which overrides this shortcut in Grist.
This happened to me and caused a large batch update, which I could not undo, because it caused an application error. (I have reported this in the embedded Help Scout.) I had to restore an earlier snapshot.
I can’t imagine this command is needed very often, so I would suggest one of these solutions:
- reassign to a non-conflicting shortcut
- use a confirmation dialog
- remove the keyboard shortcut entirely