The majority of the advanced settings are controlled via the Parsec Client. To edit these settings, please visit the config.txt file stored in the same directory as the Parsec Client. On Macs, this directory can be found by right clicking on the Parsec Application in your Applications folder and choosing "Show Package Contents". On Windows, you can search for the Parsec Server folder.
USING THE COMMAND LINE
Parsec can be run via the command line. This is especially important to Raspberry Pi users, but anyone can use the command line to launch the Parsec Client. All of the settings above can be included when launching from there. Each setting should be separated by a colon.
parsec server_id=YOUR_SERVER_ID network_protocol=1:server_resolution_x=2560:server_resolution_y=1440
If you installed Parsec before the new deb package system, you will need to run that command in the client-rpi directory like this:
./client server_id=YOUR_SERVER_ID network_protocol=1:server_resolution_x=2560:server_resolution_y=1440