FAQ

The name 'FindObjectsByType' does not exist in the current context

Fix 1:

Upgrade Your Unity Editor to a LTS version of Unity greater than 2021.3.29

Fix 2 when it is not possible to upgrade to a LTS version:

Replace the new FindObjectsByType

With the old FindObjectsOfType which is marked as obsolete in the latest versions of Unity.

FindObjectsByType<Canvas>(FindObjectsSortMode.None);
//becomes
FindObjectsOfType<Canvas>();