Android studio lost space to coding

Question

I am so sorry because I dont know how to explain that bug. But it's seem i the space in left screen can not use to coding.

I used studio in few years but today I just got this problem.

Let see my attach's video. Thanks you.

That is my video link

Answer 1

That space is specific to a Intellij/Android Studio presentation mode called Distraction Free Mode. You can activate/deactivate this mode by going in the View menu and selecting the option at the bottom.