I didn't realize that! Apparently my Win8 machine doesn't support it, saying "This system does not support fullscreen mode", but it does work on my Win10 machine. My Win7 machine just ignores it altogether. Heh
Apparently M$ didn't think to put the option back into the properties of a command line program in the midst of their interface butchery, so try keystack alt-enter from within TCC.
At least on my Win10 machine that it works on, it's not the text mode that it used to be. It just fills up the screen without changing modes/resolutions, it's border-less and has a scroll bar because my buffer is taller than the screen.