I use annotations only sometimes, and the pane at the bottom occupies valuable screen real estate. I also don't remember shortcut keys. To close the pane at the bottom I must move my mouse to the top of the screen, switch to the view tab, then click to uncheck the annotations box. Then return to the tab I was using (usually analyze). It would be great if there were a little "x" on the annotation tab at the bottom of the screen - when you click on the "x", the annotation pane closes. This would save several actions and be a bit more efficient.