i cant create a prefab from anything . its locked
Library\PackageCache\firstname.lastname@example.org\Editor\Sources\UI\PackageGroup.cs(2,32): error CS0234: The type or namespace name 'UIElements' does not exist in the namespace 'UnityEngine.Experimental' (are you missing an assembly reference?)
You are trying to replace or create a Prefab from the instance 'SafeAreaManager' that contains the script 'SafeAreaManager', which does not derive from MonoBehaviour. This is not allowed.
Please change the script to derive from MonoBehaviour or remove it from the GameObject.