Asking again because I don't have enough reputation to post the answer here.
1 Answer
It took a lot of fiddling but eventually I found a combination of flags that works in 2021!
This tells Chrome to ignore all SSL errors, disables the "Chrome is being controlled by automated test software" message and starts in full screen. Add it to the Target field of your shortcut:
"C:\Program Files\Google\Chrome\Application\chrome.exe" --ignore-certificate-errors --test-type=webdriver --start-fullscreen