Hello,
Tell me if the following screenshots work for you
You can change the width of the menu in the header – https://gyazo.com/a5867a3b08eba1dbaed3d20000b4d21f to https://gyazo.com/52113773d8bb45180e521b1b44a74150
and reduce paddings – https://gyazo.com/d0fe10f2efad075874843749c0bf76a1
Regards