To enter comment mode in Writer one can use a shortcut Ctrl + Alt + N.
However, to end the comment I seem to be forced to utilize my mouse.
How can I avoid the mouse?
This will end your comment and jump you back into the main document area right where you left off.
Found a new "escapeless" way to exit -- Ctrl + Page Up or down. Not sure about why this works, but I find it easier than hitting Esc, which is quite out of the normal reach