Within Teamwork Desk, you can set Desk 2.0 as the active version for all agents on your site, removing the option for agents to switch back to Desk Classic.
By default, all agents will have the ability to switch between versions via the profile dropdown menu.
To enable Desk 2.0, click your profile icon and select Settings from the dropdown menu.
Note: Only site administrators have access to site settings.
In the Settings area, go to the General tab and choose Site Settings from the left hand menu.
Under General in the site settings, scroll to the Use the new Desk 2.0 option and toggle on the switch to enable it for all agents on your site.
Once enabled, all agents on your site will be locked to Desk 2.0 and no longer have access to the Desk Classic interface.
For more information, see: Teamwork Desk 2.0 Overview