Locking an element to the design canvas fixes it in place so that it stays right where you want it while you continue to tweak your design. When an element is locked to the canvas, it will appear with a thin red border and a lock icon in the top right when you mouse over it or select it in the Editor.
Select the Lock icon in right corner of the top toolbar.
Or, right-click the element to bring up the context menu and select "Lock" from there.
Unlock an element the same way you locked it: click Unlock (the same Lock function) in the top toolbar or select unlock from the context menu when you right-click on an element.
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