Gnome extension 'Alt Tab: Raise First Window' cannot be disabled

I'm new to Linux and I'm using Pop!_OS 20.10 x86_64. The system by default enables an extension **Alt Tab: Raise First Window** and I cannot *disable* it: I disable the extension from **Gnome Tweaks** and also disable it from **Extension** app (green icon). But Alt + Tab still just raise one window. Example: I opened two folders in two windows. Press Alt+Tab, just one folder shows (the last used one). It should show two options to raise one of the opened folders (like most Alt+Tab does). But with I only get one choice so I cannot switch folders. This image is what I expect (not what I get). Could anybody help me with this? Thank you very much!