Dual monitor is not filling the screen

I connected my laptop to external monitor (bspwm) and the content is cut, not filling the screen width.
If i set the external monitor as the one and only, then the panel (polybar) and windows are ok. (seems that laptop screen is managing the content of the external screen)

Captura de pantalla_2021-10-20_19-18-01

:pray: i read wrong …

Seems like your screen or the windows are still set to your lap screen try xrandr -q to get the port name of your external monitor then try a xrandr --output <you external port> --mode 1920x1080 to check if it works and reset your windows.

This might help you.