https://www.vive.com/eu/support/cosmos/category_howto/can-i-use-vive-cosmos-when-steamvr-is-in-safe-mode.html
Can I use VIVE Cosmos when SteamVR is in Safe mode?
No, you cannot. Make sure that SteamVR is not running in Safe mode before using VIVE Cosmos.
use vivecosmossteamvrsafe
https://www.vive.com/nz/support/vs/category_howto/pc-screen-goes-to-sleep.html
Why does my PC screen go to sleep when I use VIVE Desk?
VIVE Desk puts your PC screen in sleep mode to prevent others from viewing your screen while you're using VIVE Desk on your headset.
pc screengosleep