I think it would be a great feature to add the ability to hide/show folders in the project view, to help declutter and hide folders we don’t want to interfere with whilst building / maintaining a site.
e.g.
I have these folders that I don’t need to see in my project view (except perhaps in a 0.1% of the time when I need to alter something core).
screenshots
previews
pgia
bootstrap_theme
bootstrap
_pginfo
_pgbackup
So hiding them, whilst not obviously removing them would be helpful.
