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.