Unable to save layouts in Edit Mode unless I check "Character Specific Layout"

Hi, I have the issue of being unable to save my layout in Edit Mode unless I check the box “Character Specific Layout”. If I leave this unchecked, the Save button is greyed out. I’ve tried a workaround I found online (toggling Raid Frames & Boss Frames, exiting without saving, and trying again) but it didn’t work.

The only workable solution I’ve found is to share the UI, save the export string in a document, and then manually import it on every character. but even then I can only import it as a new Character Specific Layout.

Anyone know how to resolve this?