1. Click and hold on the unity panel icons that you want to move.
Below is the normal Unity Panel shown in left side. Normally you will click and hold these panel icons in left.
2. While clicking and holding, drag the icon to the left, Now move the icon on the desired location .
Below is the unity panel icon you can see dragged, I have dragged the terminal panel icon and moving it then I can place in any place I like to place.
Hope this is helpful to you.