When the console is moved to the PiScreen, no console will appear out the HDMI port.
The console can be moved back to the HDMI port by deleting the text below from /boot/cmdline.txt
fbcon=map:10 fbcon=rotate:2 fbcon=font:ProFont6x11
This can be down from a Windows or Mac PC.
You can always leave the console on the HDMI and manually swing it over to piscreen with
con2fbmap 1 1
and back to the HDMI with
con2fbmap 1 0
This will have to be done every time the Pi is booted.