Post screenshots of your desktop.

Make a Screenshot on Android 4.0 or higher, by holding Volume Down + Power at the same time.

Fix the Rotation by following these Screenshots:
1. Go to the Settings.
Screenshot_2013-03-29-11-19-40.png

2. Go to "Display".
Screenshot_2013-03-29-11-19-56.png

3. Turn on "Auto-Rotation".
Screenshot_2013-03-29-11-20-17.png
 
Main Button?
Is that something Samsung-specific?
 
So, my answer is "Yes", it's Samsung specific.
 
Which phone is that?
Phantom L said:
How do you screenshot an android?
If your phone doesn't have a preset for it, there are apps in the Play store that will let you do it.
 
According to a quick Google search, all you have to do, Lily, is hold down the Back button and hit the home button.
 
Gundam Tanaka said:
According to a quick Google search, all you have to do, Lily, is hold down the Back button and hit the home button.