Could the proxy dialog have a “Use system proxy settings” option, as in Firefox (search Firefox’s settings for “proxy”)? Typing in, say, “127.0.0.1:9050” does not work.
If you want to use SOCKS5 proxy, type in socks5://127.0.0.1:9050
As for “Use system proxy settings”, it is technically possible, but I don’t know how exactly it works across operating systems. Some use somewhat standardized environment variables (but IIRC it varies a bit even between Firefox and Chrome how they are interpreted), but Windows and macOS may have some other mechanisms.
Thank you, yes, that works and is helpful information. It would be great to have it in the page. If it is difficult to implement a “system proxy” setting in the Deltacore because it is platform-specific, would guidance in the UI be simpler? Literally something like “Example: socks5://127.0.0.1:9050”, or a link to an online help page?