Through the Power Platform admin center, the administrator can control who can create an environment in the Power Platform.
Click on Gear Icon >> Power Platform settings
There we can specify who can create production and sandbox environments & trial environments.
Let us set it as Only specific admins and save the settings.
With this particular setting now only the following admins will be able to create environments.
Global admin, Dynamics 365 Admin, and Power Platform admins.
The non-admin user will get the below error
Your tenant’s administrators have disabled trial environment creation for non-admin users. You need permission to create a trial environment in your tenant
In case of Everyone, the below license determines who can create environments.
Hope it helps..