I use the “Page Builder by SiteOrigin”. It works perfect until the last update.
The way you said, it doesn´t worl, cause it makes the whole site wide. That´s not the right way.
Only applies to the page/post it is enabled on. Can you test that – and if the whole site turns full width – leave it enabled and let me know so i can take a look.
OK… that doesn´t work. Ich have set the site to width 1200.
The page builder tool set some parts on full width. But the full width of the page builder is not working. I think generate press deactivate it.