Hi @Mike Kerr
Do you want to open Edge in kiosk mode with three tabs using the command line? If so you can try the following command:
msedge.exe --kiosk www.google.com www.msn.com www.microsoft.com --edge-kiosk-type=public-browsing --kiosk-idle-timeout-minutes=1
I test in Edge Version 89.0.774.50 (Official build) (64-bit) and it works.
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Regards,
Yu Zhou