The reason I did not suggest the Esc button is because it is a multi-level action button.
Lets say you have a Marquee on you Floor Plan, plus you have selected elements and are moving them.
In such a case the first Esc cancels the move operation
The second one unselects the elements.
The third one clears the Marquee
The fourth one switches from the active Tool to the Arrow Tool.
But the Arrow Tool/Last Tool Toggle (that's its name in Work Environment) always achieves this in one step.
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