Widget switcher: 1st active index's still showing

Hello, I’m not good at English so let see the picture below: Another 4 tab work fine, they hide when I go click another tab, but the first active widget’s still show. this might be a noob question, I’m new to unreal. I try search for problem on google but couldn’t find anything. Pls help!!!

243304-3p.jpg

243301-4p.jpg

243303-2p.jpg

No one know? pls. I’m still stuck.