Hi! I need to hover in the inventory on the slot is called widget, how do I do? help, please 
hi you probably need to provide more details, are you talking about one of the inventory tutorials or doing your own?
could you provide a ss of your BP?
have you set focus via one of these input modes: https://docs.unrealengine.com/latest/INT/BlueprintAPI/Input/index.html
Standart UMG UI inventory 