You can disable a Built-in package if you don’t need some modules and you want to save resources. However, when you disable a built-in package, the corresponding Unity functionality is no longer available. This results in the following:
To disable a built-in package:
Open the Package Manager window and select Built-in packages from the Packages drop-down menu.
Select the built-in package you want to disable. Its information appears in the details view.
Click the Disable button.
When the progress bar finishes, the check mark no longer appears next to the built-in package and the Disable button becomes an Enable button.
If you want to re-enable a disabled built-in package, click the Enable button.