How do I move the toolbar in IntelliJ?

I'm writing this answer because I wanted the opposite. One day IntelliJ suddenly started aligning the buttons to the left.

There are at least two toolbars in IntelliJ:

• The Toolbar which is aligned to the left,
• and the Navigation bar which is aligned to the right.

The buttons of both toolbars can be customized independently.

Therefore, in order to show the toolbar one side or the other, press CTRL + SHIFT + A and then type either View Toolbar or View Navigation bar.

click on Main Menu | View | Toolbar