Can I deactivate my Mattermost account?
No. Only system administrator can deactivate your account. You can not deactivate your Mattermost account once created, but you can leave a channel or team by following path:
For leaving team: (Menu) ≡ → ‘Leave Team’
For leaving a channel, go to that channel, then click on that ‘channel_name’ → Leave Channel
If you are a system administrator, you can deactivate a members account by following path:
(Menu) ≡ → System console → Users → Member↓ → deactivate