also the Version information at the lower left corner is now the 'About' button, just click on it and the About Nirans Viewer floater will pop up. well thats the unnecessary 'Close Viewer' button you basically wont need because you can just click the X, however if you should come across Space Magic and the menu should vanish and the X button of Windows not work anymore then you can click that little X button over there haha.
For those that asked about the small one-way-in street sign (xD) to the left of those preferences.
And comes with a basic preference panel to revert core options if you broke something inworld and it somehow got saved, causing you to freeze/crash to death.