how to restart unreal engine 5

hi I need help in ue5 first (i am starter) i was playing around with the engine the i deleted the principal tab of the word i did press the little x button to delete even i tried to restart the engine and did a new blank project but i cant even see the image its just black i need help and how i restart the engine like reset it from 0

Hi @ALPHA1.E, you can reset the default window layout of the Editor by going to Window → Load Layout → Default Editor Layout.