Custom width?

Yes, This is possible to change the width using custom CSS.
The custom CSS will depend on the template that you are using.

Right now you are not using templates created using this plugin on the page that you have linked. Can you give me a URL where you have used this template so that I can give you a CSS that you can add on yout site?

Just reactivated the plugin and applied it to this page. Thanks in advance for the extra CSS. I’m not terribly experienced with this, so if I can’t add the code via Customize / Additional CSS, you’ll need to be quite expliciet about where the extra code should go.
Thank you!

Here is the CSS that you need –

.page-template-template-page-builder-no-sidebar #content {
    max-width: 80%;
    margin: 0 auto;
}

In this you can change the value of max-width as per your liking. This can also take values in px for example – 1200px

Here is a doc which explains about adding custom CSS to your site – https://wpastra.com/docs/adding-custom-css-code/

Works like a charm – THANK YOU!!!

This is a great addition to your plugin – worth publicizing better. ??