How can I lock an element?

If you want to keep an element in place so it doesn't move around while you're selecting and moving other elements, you can easily lock it.

Just open the toolbox by double-clicking on the element and click the lock icon.

Open toolbox and click lock button

When you select a locked element its outline will be red instead of blue. You can still double-click and edit some properties on a locked item, but you cannot move it or change its size.

Selecting a locked item