I totally love the CircuitLab plug in, I really do. But this behavior is ... let's call it 'noteworthy'. Look at the circuit diagrams for series and parallel resistors, they're huge.
Basic rules to calculate the equivalent resistance of a resistor circuit
I propose to use a ×1 scale at max. Scaling down my turn into an issue too, rendering the circuit too small, but I've not come across one yet.