Pretty sure you can't remove those menus while testing. They're there for that very reason, to help you test the SWF. If you really want to remove it you can always publish the SWF and look at it in the browser but you'll have "the browser" wrapped around it which isn't much better.
Thanks for your quick answer. But this panel still remains when I export my work in its final SWF format. Just a slight precision: when I began my project it wasn't here while testing. It seems that it appeared consecutively a "bad manipulation"...
How are you viewing the SWF? If you're just clicking on it in your filesystem to open then by default it will be opened by "Flash Player". Those menus are a standard part of the Flash Player application.
As mentioned, if you drag your SWF into a browser you will not see those menu items.
Also if you intend to run the SWF itself you can export a Projector (CS6 and below, not supported on CC). That will make an executable (.exe for Win, .dmg for Mac) which will not contain these menu items.