This tablet has 1/5 of the left side unusable due to a cracked screen and now some icons started to appear at the upper-left corner (google search, facebook 'something', etc.) and at the same time the rotation capabilities while using any app that's not a game like solitaire or mahjong is disabled. For reaching any button on the affected area is imperative to rotate the tablet or using a keyboard shortcut, which for now I don't know if they even exists.

What might be causing this odd behavior? How can I solve it? Is there any such keyboard shortcuts?

Relevant data: Android 4.2
Main app that causes trouble: ShowBox

Thanks in advance for any help on the above issues!