Pin and unpin bubble

When you move a bubble, it becomes "pinned" in one place. After that, the bubble doesn't move even if you select a different layout. This is because we assume that if you moved the bubble to a specific place, you want that bubble in that location. 

If the bubble stays in one place and you want it to move with the rest of the bubbles, click on the 'unpin' icon in the bubble menu.