Stage Editor

I make a stage, but how to save it?
No quit button or save, when I pres alt+f4 and come back, my stage dissapear. (I thought it's auto save)

Any help will be greatly appreciated.

I haven't stage editored for a long time. But, if I recall correctly, there's a glitch where the toolbar on the top is "up higher" than it should be.

Imagine you're trying to click on "File", but with the mouse higher than the window would look like it would allow. Click. There should be Save and there should be a Quit.

On the top left there's a bar that has the following on it:
FILE EDIT PREVIEW HELP

Click and hold your mouse button down on FILE. While holding the mouse button down, move your mouse over "SAVE S". Name your stage and it will be saved. You can then exit by going to File > Quit Q