Full-width row or content box

Hello,

i have been back and forth between themes – what a learning curve.
1. tried Supreme but couldn’t find a way to make the width of the body full page
2. switched to GP – they have sections for the variable sized rows, felxibility, but realized i’ll need special customization for location and category headers.
3. found listimia which is much closer to what i need in both functionality and look, but before I buy another theme I wanted to makes sure that there isn’t an easy way to customize supreme. I tried following https://wpgeodirectory.com/docs/customizing-your-style/ and using inspect code but got lost in all the classes and functions. eventually i ended up in starter theme reset folder. I also tried the beaver and their instructions on how to make something full-width and I also tried following this: https://www.wpbeginner.com/wp-themes/how-to-create-a-full-width-page-in-wordpress/ but supreme already has full-width-page template it’s just width restricted?

So to make a long story short.
1.Is there a way to either create rows with 100% width with css or with one of the builders? Or is there a way to set the total page width to 100%?
2.Also, anyway to customize displaying title. There’s a way to switch it off globally but i’d still like a title for location pages.
3.Also, there’s a great header for location pages but not for categories pages.
tia