When an object is selected, small square boxes indicates you how to resize it with the mouse. Click on the small square boxes for resizing the object in the wished direction.

Not all objects can be resized. The following table indicates possible operations:

(*) Resizing a variable box vertically enables you to display together with the variable name its tag (short comment text), its description text, plus its I/O location it the variable is mapped to an I/O channel. The variable name is always displayed at the bottom of the rectangle:

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