I currently use VCV's oscilloscope but the inability to resize to full screen is a real bummer.

I plan to try those over the weekend to see if any could fit the bill a little better:

https://socalabs.com/analysis/oscilloscope/

https://bomshankamachin.es/plugins/occularScope

https://oscaudio.gumroad.com/l/Oscilloscope

--- Voltage control all the things ---