I just found a neat feature in Easel. Maybe everyone else knew already and I’m late to the party, who knows.
The “Domino” of radio buttons that you use to define a reference point when you’re moving your shapes around also functions as an anchor if you change a shape’s dimension.
For instance, if I had a rectangle, 150mm wide by 100mm tall, whose right edge was in the correct position but needed to be 160mm wide, I could click on the upper right point on the domino and when I change the size of the rectangle it will leave the right edge where it is and extend the left edge.
Very unexpected and cool!