Linux noob here 
just want to know is there any way to block some IP address for Overwatch 2 on Bazzite ( Fedora linux ) ? i googled it but couldnt find the correct one.
firewall is not very clear..
You may want to consider third party software here….note that this is still a bit of a process.
Consider these:
Note that you may need to use a short terminal command to get the portmaster service to run after every boot. If you need more details/support you can visit their discord.
Note that this essentially replaces firewalld, so please do keep that in mind, you will need to manage all firewall rules from portmaster. Upon uninstall of portmaster (rpm-ostree reset command in terminal) and disabling portmaster service, FirewallD will once again take over next boot.
Have not tried this, but also has similar functionality:
Also note that these will need to be layered with rpm-ostree though, so it is possible that during a version update (like going from Fedora 43 → 44 in the future, that you may need to temporarily remove the packages to upgrade using rpm-ostree reset command in terminal.