Oh, very weird! I know initially the Filter brushes did not have an icon which made it harder to find, but I’ve never personally run into an issue where they simply weren’t there (when they should have been). By default, those brushes should be enabled and there isn’t any extra steps you need to take in order to see them either.
Do you still have an older version of Blender saved on your PC? Sometimes I open Blender and it opens an older version, which may be your case. I’d look at removing any older versions you have and when you open Blender make sure that it is the newer version that you’ve downloaded. I can’t think of any other reason why they wouldn’t be there, so I’m hoping that is the issue!
