How can we unset the proxy environment variables?

[Nefcanto]

I downloaded Hidify, and ran it. After a while I stopped it and quit the application.
Yet my curl fails to connect. It's because of the proxies set in the environment variables somewhere.

I can see them using env | grep -i proxy:

no_proxy=localhost,127.0.0.0/8,::1
ftp_proxy=http://127.0.0.1:12334/
https_proxy=http://127.0.0.1:12334/
NO_PROXY=localhost,127.0.0.0/8,::1
FTP_PROXY=http://127.0.0.1:12334/
HTTPS_PROXY=http://127.0.0.1:12334/
HTTP_PROXY=http://127.0.0.1:12334/
http_proxy=http://127.0.0.1:12334/
ALL_PROXY=socks://127.0.0.1:12334/
all_proxy=socks://127.0.0.1:12334/

I find nowhere to unset them in the GUI. Where can we unset them?