How do I open the main menu?

We are phasing out Zendesk. Please see Discourse instead: https://community.getmailspring.com/t/open-the-main-menu/284

 

On Windows, a button in the top right of the main window allows you to open the main menu. The icon looks like this:

 

 

On Linux, the menu may not appear unless you press the Alt key. Depending on your Linux distro, it will either appear at the top of the window or at the top of the screen.
On Mac OS X, the menu appears at the very top of your computer screen.