In the Admin Console, go to Packages > Create a Package > Managed Package > Options section. Then, deselect the Show apps Panel check box to disable the Apps panel.
When you disable the Apps panel, the end users see a message in the Apps tab that says, You don't have access to manage apps.
The Creative Cloud Packager cannot be used to create packages that include CC 2019 apps or later. Learn More.
You need to sign-out of the Adobe account and sign-in again to see the change in the Creative Cloud desktop app on the end user computers.
You can choose to allow or disallow your end users to update and install apps on their computers. See how to do it for packages created using the Adobe Admin Console or the Creative Cloud Packager.
In the Admin Console, go to Packages > Create a Package > Managed Package > Options section. Then, deselect the Allow non-admins to update and install apps check box to disallow self-service for end users.