Delete all Type-1 Fonts from System

Hello, type 1 fonts are no longer supported. Can’t they be deleted from the system? I have tried, but the delete button is grayed out.
Thanks for your help.
typ1-fonts.jpg

The fonts you see marked with a solid red circle in your Active view aren’t actually installed; they’re only temporarily loaded. Since MainType doesn’t know where these loaded fonts are located—if they’re even stored at all—it can’t remove them. You may be running another font manager, or there could be another issue at play.

I want to let you know we did fix an issue related to detecting installed Type 1 fonts. We released an update in January that should most likely solve your reported problem.