During a connection, the hosting computer can change the resolution of the stream from host settings.
Autodetect will force the hosting computer to match the client resolution if the connecting user has permission to connect without approval or is the owner of the computer. Keep host resolution will never change the resolution of the hosting computer.
If your hosting computer does not support the resolution that you're requesting based on Windows Display Settings, Parsec will switch to the closest resolution available. To add a resolution to your hosting computer, please add that resolution via Windows Display Settings or the AMD/Nvidia control panel.
If the resolution you want to switch to is not listed in Parsec, you can use this advanced setting.