As an account owner, you can control whether, or not, other Members on the account can remove Wedges.
To do this, navigate to the Settings page and click on the Company tab, there you'll see a switch that says "Allow Wedge Removal" next to it. If the switch is turned on, Members and Admins will be able to remove Wedges. If the switch is off, nobody will be able to remove Wedges.
Only Company Owners are able to access this setting.