Disable multiple selection in Android Studio?

I was coding something and suddenly android studio started placing cursors on each and every selected line. I dont know if it is a feature that was fired because of some shortcuts that I am not aware of. This is the gif screencast.

How can I disable this behavior? Is it a feature? If so how to activate and deactivate it? What is it called?

You must have activated Column Selection Mode.

Use Main Menu | Edit | Column Selection Mode to toggle it ON/OFF.

Check more on different ways how you can work with Multiple Carets: https://www.jetbrains.com/help/idea/multicursor.html#column_selection