ZBrushCentral

Question about documents

I modeled an archway that I wanted to save as a large psd file. So I resize the document and I can’t zoom the canvas out to see the actual archway. Also if I want to sculpt on the archway some more I can’t because it is now a document after resizing. Infact, I can’t sculpt anything without exiting zBrush because it is in document mode. Anyway to get out of document mode?