Open the Facebook Page
Click Settings
Click Page access or Page roles
Find the admin you want to remove
Click the Edit or three-dot menu next to their name
Select Remove access or Remove from Page
Confirm the removal
Enter your password if prompted
Open the Facebook Page
Click Settings
Click Page access or Page roles
Find the admin you want to remove
Click the Edit or three-dot menu next to their name
Select Remove access or Remove from Page
Confirm the removal
Enter your password if prompted