I'm using QuestaSim 70.7b; And I can not change the height of waveform signal.. I've tried many options, like this:
add wave -radix hex -format analog-step -scale 100 -height 100 -color gold /bin_top_tb/clk
But nothing happen, just height of the name signal is changed, like shown below
*thanks to dave_59, to change the height you should go to Tools -> Edit Preferences and change WaveFont and then footerFont exactly at such sequence, then click apply and ok.
There's no way to change the height of individual digital signal. You use the main preferences to select a larger Wave Window text font, and the size of the waveform gets scaled to match the wave label.