i have 2 problem

Good evening,. I have (2) problem I have almost finished building my site and I see that the layout of my site is very large or the margins are very large I would prefer that my layout be like this site in Narrow options are missing! I would also like to change the colors and have a scrolbar in the sub menu of the header I do not see too many options they are limited for such a beautiful theme here is my site thank you