Mobile:
- Click More in bottom right
- Go to the Teams & People tab
- Select the person that you want the remove from your organization
- Select Remove from Organization
- Click Confirm
Web:
1. Go to Teams/Users tab
2. Click Users
3. Find User to remove from organization
4. Click 3 dots (⋮) to right of user name
5. Select Remove from Organization
6. Click OK to confirm