Command Window

My command window recently had an issue with not expanding properly (couldn't see the text section) so I closed it, and it said use F9 to re-open. I have tried this numerous times and can't get it to open up again. Pressing F2 brings up the overlaid command window history, but I can't dock this into the workspace as the other one was. I've looked all through the help manual, and various settings / menus etc trying to find an alternaitve way to bring it back up, but haven't found anything yet. I've tried a second keyboard, so it's not a faulty key either. Any suggestions please on how to re-open command window that can be docked in the workspace, and doesn't rely on F9 ? Thank you.