I go to folder > folder options. Then set my columns. I save format for all folders (middle option) and tick the two boxes.
When I restarted the program, Status and Availability columns are back. I've tried a few times and now I cannot even remove the columns manually. My other preferred columns are all included in the right way. How can I get rid of the two columns?
The folder formats for a few types of folders will augment your chosen columns with extra ones we felt are usually wanted there, when you save a new default format. (Otherwise, for example, you would no longer see Location when looking at a file collection, which would make them a lot less useful.)
If you don't want the extra columns in those special locations, you can remove them: