change wordpress width

You can do this by editing the content area in your style.css file.

Make sure you create a child theme so your changes are kept when you update your theme.

Create a child theme: https://codex.www.ads-software.com/Child_Themes

Here is some more info for you to help you change the width of Customizr theme.

https://docs.presscustomizr.com/article/72-guide-to-css-and-html-in-the-customizr-wordpress-theme

https://presscustomizr.com/snippet/changing-the-global-column-layout-of-the-customizr-theme/

Let me know if you need more help.

Tess