I have had no problems with WFC, but can you run WFN alongside another firewall? Because I don't want it to mess up things. Last year I tried to run TinyWall and WFC at the same time, that was a bad idea.
It might conflict with WFC, although I'm not sure. When you launch the WFN.exe executable is it creates a scheduled task to launch the notifier.exe when you log in. Besides viewing application connections, it also allows you to access the Advanced settings directly for viewing or creating/modifying rules. You'd be running two applications that have direct access to the Windows defender fw filtering platform.
WFN - Windows Firewall Notifier Nightlies / Unstable (March 16, 2020) Download WFN 2.1 (To do / In orogress / Done)
WFN - Windows Firewall Notifier 2.5 Beta (January 5, 2021) Download Spoiler: Changes 2.5 Beta migrated to .NET 5.0 (the alpha went through .NET Core 3.1 first, but 5.0 was here so... why not) new layout and design. fixes and improvements. an important one (do not miss it!): Notifier will now run in the background and will stay open, if you enable notification. This fixes all CPU related issues, and multiple Notifier.exe process spawning as well. Please tell us if the "old mode" was best for you, I might reintroduce it later. libraries updates (note: the used libraries and dependencies will be added soon in the about page - the main change being Oxyplot for the bandwidth graph instead of a custom one). Versions You can either pick the AnyCPU build (if you already have .NET 5.0 installed), or the x64 / x86 builds depending on your CPU if you want a standalone version (which also offers better performance). Please note that the IP database is always embedded, if you'd like a lighter version without it, feel free to tell. Disclaimer As usual, this is a beta release, not all cases have been tested and you might encounter unexpected behavior. Please report them in the Issues page (or open a new discussion through the new GitHub feature if you have some ideas, improvements, and so on!).
Sorry forgot to reply. Thanks for the info and then it's probably indeed not a good idea to combine it with WFC and TinyWall.