How to make a sidemenu from the marked ones

Hello, there is a picture I made for you, I need a help, I′m redoing a page after someone else and I need to move the marked banner menu to the left and make it horizontal. Also the black/dark grey background I cant seem to find any option to change it, any idea of where to change it? Thanks link to the picture: https://imgur.com/MoGeZd2