Find/ replace not working

Find/ replace does not seem to be working. If I do a large section, looking to replace double spaces with single spaces, it picks up some but leaves many.

Any ideas?

For this specific situation, I’d recommend using the command Format -> Convert -> Multiple Spaces to Space, rather than the general search function.

One thing that might be happening with the general search/replace function is that it correctly changes two spaces to one, but doesn’t iteratively turn three into two, and then two into one.