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# install XQuartz
#: for example <code>brew cask install xquartz</code>.
# enable full screen mode in XQuartz
# ssh -Snone -X z800.local
#: you might need to force HiDPI mode for that application, but it should have all pixels available.
# to get out of X, press CMD+Opt+A
#: unfortunately this turns off the X resolution.
# to get back into X at the correct resolution, run <code>xrandr --output default --mode 5120x2880 --dpi 218</code> again in the native terminal.
It's awful, but it works.