In the Relationships group click on Object Dependencies.
Click on your Query then click the Refresh link on the Object Dependencies Pane, and you will see a list of all objects which depend on the selected Query.

You can do a global search on your VBA code to see if a query is used in any VBA code.  Open the VBA editor (Database Tools -> Visual Basic) and go to Edit, Find, and search "Current Project."

Both excellent ideas from The Kevins (as always). What I will usually do is rename something I'm considering deleting to like "CustomerQ - renamed for deletion on 2022-11-22" or something like that, so if a month goes by and it's still there and flames haven't burst forth from my database by then, it's probably safe to delete. But always make sure you have a good backup copy squirreled away somewhere too.

Thanks to both Kevin's and Richard   I knew I would get a great answer but didnt think it would be so quick.  Fantastic advice and support.  Many thanks.

I do it slightly different in that I make a copy of the database and give it good name so that you do not mix them up. With that copy I either rename my queries or just delete them and test it all out.
I have used this many times to clean up my tables and queries. It does not take too much time to find if you have knocked out a query, table or something that required.
I think I would go Kevin and Richards way. (Smiley face)