I dont know how to get my folder tree back

I removed the folder tree and saved it as a lister, now i cant for the life of me find out how to add it back so here i am. I searched the settings and found nothing. Also checked under every dropdown i could and still cant find it.

Try F8

Thanks, that worked. Would still love to know where the actual setting is though. But if no one know that's fine

Lister > Folder Tree, near the top right of the main window.