Hello, the software is a bit opaque, not surprised it isn't completely straightforward.
Pop the debugging console open with ctrl+c and see what actually appears there when you select the com port in the interface. You might see an error message that means something.
Is it the code from the big code bundle? I've been doing some work on the polargraph_server_a1 code recently, and it is a bit more efficient on space now. I've not made up a new bundle because it's not really been tested very well, but you can try and download it from https://github.com/euphy/polargraph_server_a1 and test that if you want to squeeze more onto the arduino.
It won't fix your problem, and it might add new problems, so I'd recommend fixing this connection issue first.
Text size. Yes, it's small. I've been porting the controller to processing2 and the modern version of controlp5 recently (controlp5 is responsible for the GUI), and I hope that that might make text size modifications a bit easier. It's unlikely though.
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