Set Postman to use Proxy

Is there a way to set the Postman desktop app to use a specific proxy server? This question is NOT about the proxy settings for the requests inside the Postman, but for the Postman service itself. When I use Postman in our company VPN, it often says offline. For external sites, there is a specific proxy server to use. So, my question is how to make Postman to use a specific proxy server.