Hi Neil! Thanks for reaching out with your BoldGrid Post and Page Builder questions!
From what you’re referencing, I’m thinking you’re speaking of the Full Screen editing option that’s included with Post and Page Builder. If you need to come out of this mode your can click the “maximize/minimize screen” option towards the top right corner of the page builder.
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Note that the right hand sidebar will appear based on screen size. On larger desktop screen sizes these same settings will be available below the content.
I hope this helps! Please let us know if there’s anything else that we can answer for you!