Happy New year
@Alberto Michelis.
If my memory serves me correcty, I get the height of the Toolbar (Title) so I started the Menu.Top of the menu using Toolbar.botton + 1.
Basically you just start the menu height at the height of the toolbar bottom + 1 Dip.
Sorry I can't give you the exact code as I'm currently having alcohol memory blockage issues lol, I'm currently out celebrating being alive to see yet another new year in (2019) and my development laptop is about 35 miles away at home, so no code to look at.
But I believe that's how I did it and it works with all devices.
I absolutely love Erels sliding drawer solution, it's great and way better than the solution that I was creating at the time of release for myself.
Edited:
By the way, after doing the above you must set the menu height as the main panel height - Toolbar.Height, that way the menu height does not go off the bottom of the screen.
I forgot to mention that previously.