Configurar ancho de pantalla

Maybe ask the same question here? https://www.ads-software.com/support/theme/byblos/

You can set the width of the main container to be calculated so that the menu width is subtracted out. Then float it left so it is not under the menu. However, the slider width is set inline by script. The slider’s script must be modified in order to be resizable. Either that or find a slider that does not need a script to be responsive.

Gracias @bcworkz
Aunque entendi muy poco lo que tengo que hacer ya vere como hago para solucionarlo. Muchas gracias!