I have a dual monitor and I wish I can pop out the \"source pane\"(where I edit my code), so that I can edit the code in one monitor and track everything else in another.
I'm using the latest Studio and encountered similar needs. I found that ctrl+shift+number will suit my needs most of the time since it zooms to the pane that I desire and can also back to the full four window layout.
An additional trick is customize the hotkey to alt+number [1,2,3,4,5] so the pane zooms more handy with one click by your left hand on the keyboard.
Hope it helps.
This feature was just added to RStudio this week. You can try it in our daily builds (0.99.636 or newer):
https://dailies.rstudio.com/
To pop out your file to a new window, either:
If you try it, let us know what you think on the support forum.