To leave a Space that is invite-only or has a free Plan, select the three-dot menu next to the Space, click More, then select “Leave Space”.
If you leave a Space, you won’t see the activity in that Space anymore, and it will be removed from your left-hand navigation.
To leave a Space that has a plan, you will need to cancel your subscription by clicking your profile picture in the upper right-hand corner > Plans and Access. You will lose access to the Space at the end of your billing cycle.