Can't change LB for RB (XBOX)

Hi another imposible to do configuration.

I want to change/switch RB for LB buttons.

Cause i want to throw granaderos with LB (instead of RB) a simple button funciona switch. BUT IS IMPOSSIBLE TO DO!!!

I'm on XBOX Series X

Please can someone explain us how to do.it?!?!

Btw the configutation menu is atrocious in terms of design and functionallity!