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Steven Parker216,135 Points
If you're talking about the workspace, starting the preview should not affect your ability to edit. Just remember if you make edits while the preview is displayed to first save your changes and then refresh the preview in your browser.
As long as the window is open, you won't need to start the preview again.
Timothy Hartford1,074 Points
I had this same problem. The preview somehow opened in the workspace window and not its own separate window. No Weird.