Network settings can be accessed via the burger menu.
You can configure the port number of the web server, and whether to use TLS. If you enable TLS, you will need to provide a certificate file in PKCS#12 format, and the password for the certificate file.
If you change web server settings, you will need to wait for the web service to restart, change the URL in your browser accordingly, and log in again.
The Enterprise server needs to access portswigger.net on port 443, to carry out license activation and software updates. Note that this access is needed for ongoing usage of the software, not only during initial installation. You can configure a network proxy if this is needed to reach the public web.
You will need to configure the hostname and port number of the HTTP proxy server that you want to use.