Currently, there is no way to define Left Alt + Left Shift key combination to change keyboard layouts in Ubuntu 22.04. In previous versions there was a convenient "Keyboard Layout Options" window in which there was able to set required key combination. Since 22.04 release I can't find a way to do that because useless "Keyboard Shortcuts" window opens instead in which unable to set Left Alt + Left Shift as "Switch to the next source" shortcut.
Currently, there is no way to define Left Alt + Left Shift key combination to change keyboard layouts in Ubuntu 22.04. In previous versions there was a convenient "Keyboard Layout Options" window in which there was able to set required key combination. Since 22.04 release I can't find a way to do that because useless "Keyboard Shortcuts" window opens instead in which unable to set Left Alt + Left Shift as "Switch to the next source" shortcut.