How do I temporarily remove a Côr WiFi thermostat by Carrier to repair a plaster wall?
The thermostat is simply pressed onto the mounting bracket and "snaps" into place.

See the installation guide or Carrier's video; at ~2:20, it shows the thermostat being mounted.

Since there is no description for removal, I'd try prying gently along the four edges, between thermostat and wall.

BTW, the owner's manual omits mounting the device.