I’d like to change the column width of Category in the Transaction sheet and Google is telling me:
Heads up!
You’re trying to edit part of this sheet that shouldn’t be changed accidentally. Edit anyway?
Is it ok to change it? I’m guessing it’s because the column width also pertains to the header row?
It’s fine to change the column width, won’t do any harm. That’s just part of the general warning that comes when any level of protection is enabled.
So long as you don’t change column names in the core sheets (like Transactions), @GeorgeKao, the spreadsheets are pretty robust. You can turn off protection if it gets in the way.