I was just wondering if it was possible to go full screen when watching the video preview kdenlive has at the top right. Thanks!

Click the Float / Dock button next to the x, top right of the frame then drag the size as big as you want.

Adding to yellow's post, If you want to go straight to full screen, I think you can just double click the monitor window.

Yes, double clicking on the monitor will make it fullscreen (if you have a 2 monitor setup it will go full screen on the second monitor) or from the menu: Monitor > Switch monitor fullscreen.

And pressing ESC takes us back to docked panel when needed. :-)

Thanks! This will allow a noob like myself to get around the in ability to render :)