This extension switch keyboard layout to #1 when pressing Hyper key, and switch to layout #2 when pressing Shift+Hyper.
If you want to use CapsLock and Shift+CapsLock (or Ctrl and Shift+Ctrl), you should remap CapsLock (or Ctrl) to Hyper (via Gnome Tweaks: "Caps Lock behavior: Make Caps Lock an additional Hyper" (or "Ctrl position: Caps Lock as Ctrl, Ctrl as Hyper").
In Xorg Hyper behaves like Super so you need move Hyper to mod3 from mod4.
Create $HOME/.Xmodmap:
clear mod4
add mod4 = Super_L Super_R
add mod3 = Hyper_L
Logout and login, or run xmodmap ~/.Xmodmap.