This is SO needed for project/deal optimization, Mia B.
Some platforms refer to this as "Spaces"
The cool thing is that in one account, you can have separate spaces (folders) for your various clients. And this ensures that you're on top of each build for each client.
You can set permissions of what they can see and do.
Extra bonus would be for the Lindy platform, in that they can have a signed up organization, with seperate spaces for the various internal departments...
HR, Sales, Dev, Marketing, Creative, Socials, etc.