Create "Reset only window layout to default settings"
When a user selects Edit/ Reset to Default Settings, and the Reset custom settings to default dialog comes up, lets add the option somehow to ask - reset everything, or only reset window layout only.
This is needed because some users accidentally click the X on the Properties tab, or drag it off, and don't know how to put it back. Reset to Default Settings is pretty draconian to just fix this simple problem. (Of course, being taught the correct way to get the tab back is really the answer. But, we work with what we got.)