To add secandary layout for i3wm it's just simple like like this to add in config file
~/.config/i3/config :
exec setxkbmap -layout us,ar -option grp:alt_shift_toggle
This comman is adding arabic as second layout and use same windows switch keys "ALT+SHIFT".
and this comman it's work on command line also but without exec .
Have fun :D
