Lxqt : switch layout buttons stuck to "alt while pressed"

when I try to pick a button to switch the keyboard layout on the fly, only options available are Left Alt or Right Alt While Pressed, making it unusable as it is both impractical and after trying to change it in the lxqt sessions.conf it does not function at all.
Only choice is to click on the language icon on the task bar.

Is there any other option available so that I can add alt+shift or crtl+shift?