I think this has been mentioned before. But when working on a large website and making changes/adding a new page, it sometimes take a while to preview it because it all has to export first and then click to the page you want to view in order to check what is sometimes a very small change. And if it's a new page without a link to it you have to first make a link to it somewhere in order to get to it. Having to do it once or twice isn't bad, but with a large site with 20+ pages it gets bothersome. A right-click menu with "Preview Current Page" I would even pay extra to get!
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