To change the page with for all pages on your website, navigate to the Customizer > General > Page Settings.
The default setting for most website templates is the 100% Full Width Page Layout. You have to change this value to be able to change the Page Width option.
Change this prior to changing the Page Container Width, to a setting something other than 100% full width.
Here you will be able to find the Page Container Settings:
To Change the Overall Website Page Width
Use the slider available underneath the Page Container Width (px). It would change your website overall page width in pixels.
There are upsides and downsides for having increased or decreased page width though. The upside of increased page width is that you get more space to include as many design elements. At the same time, you need to take care of the white space. As more space means more responsibility to manage the taken/empty space.
A good website has to be responsive, which means it should work well at desktops (large screen) and smartphones (smaller screen). So it’s important that you plan for making your website cross-platform compatible. Fortunately, Avoori takes care of almost all these aspects so that you can focus on your core business.
As a general rule of thumb, a page width between 960px to 1200px is considered best for most kinds of websites.