Because of some bad original import years ago from Quicken, I have a lot of garbage in the "modes", and I want to clear it out.

In Payees, I can get a list of all of them and combine two similar entries into one and so on.

I don't see any way to get a list of the modes that are used. If I could do that, I could combine or just delete modes that I don't actually want. It would make it easier to readily enter the correct modes when I am entering transactions.

Have you tried to play around 'Search and Process'?