SteamVR Hide the Chaperone
SteamVR active area grid boundaries

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Put on the headset.

Open SteamVR.
Press the
Home button to open the SteamVR menu
Navigate to the
Settings icon in the bottom right of the screen.
(Make sure not to confuse this with the Steam settings in the top right-hand side of the screen.)

Next, navigate to Customise > Chaperone.

Adjusting the Bounds opacity slider to the left for transparent.