I use malwarebytes after trying several options. It's merely a good interface to leverage windows firewall with a block-until allow dialogue box. For whatever reason, it's hard to find a firewall for windows that doesn't use a scammy freemium model.
Yes, I used to use TinyWall ( https://tinywall.pados.hu/ ), which is light and simple. But, if I remember right, it uses Windows built in firewall and so I don't know if it can completely block some Windows 10 system software from contacting Microsoft.
ZoneAlarm also used to be good, but used more resources and is not free - https://www.zonealarm.com/software/firewall (note that you do not need their crap browser extensions that it will ask you to install).
We're working on a powerful (also FOSS!) alternative for Windows. It includes DNS-over-TLS and extensive firewall features. See https://safing.io/portmaster/
It's not completely stable yet, but we are making great progress. We'd love feedback!