So recently YouTube has updated there is YouTube Studio website and there are a few problems with the update. Peoples are unable to post the End screen they are getting a message like “end screen element is too small” and another message is “End screen element is too big”. Till now YouTube has not confirmed anything about this update.
To solve this issue you just need to fix your end screen in a mid-range where the error message will go there are two types of message end screen element is too big and the end screen
element is too small you have to place your element in the middle of these two messages and helpful if you can solve this issue.