Selection brush tool - how to close and save changes???

I’m using PE 7.  When I use the brush selection tool and select an area and enhance it, how do I quit the selection process and start another one. Say I select a face with the brush, use the enhance faction to lighten the shadows then want to close and save the enhancement, i.e. make the dashed selection area not be highlighted. 

I’ve tried enter, all of the control, Alt combinations etc. but can’t seen to close it other that saving it and closing.  I seem to remember some keystroke function that would close it.

Help please!!