How to create folders?

So I just watched a vid from another thread and see that the option is there to create folders, with projects 1,2,3,etc in each folder - how to do that? I probably should have asked when I first started using ser lol, still, it's never too late, as they say

ok for anyone else,

That video explains it and answers your question I guess?

yes, just sharing the video for others' future reference