And an other thing, if I try to modify the Switch-to-next-source shortcut, it still not let me to set <Alt>Shift_L, pressing these buttons makes it to be Disabled. So there is no way to set this on the gui. I can set it again with the gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Alt>Shift_L']", however it still not works after that as well.
And an other thing, if I try to modify the Switch- to-next- source shortcut, it still not let me to set <Alt>Shift_L, pressing these buttons makes it to be Disabled. So there is no way to set this on the gui. I can set it again with the gsettings set org.gnome. desktop. wm.keybindings switch-input-source "['<Alt>Shift_L']", however it still not works after that as well.