Can you provide a bit more detail about what’s happening? Are you selecting the cast button and encountering an issue, or are you unable to find the option to cast? It would help to know if you’re seeing any error messages or if something specific happens when you try to cast.
If you don’t see it there, you may need to go to Settings → Extensions which takes you to brave://settings/extensions and you can enable Media Router there if it wasn’t already on for some reason.
@lev.grdn,
Do you have any other Chromecast enabled devices you can test with? For example, a smart tv with Chromecast built in? On my end, I’m seeing my devices listed in the Sources drop down in the casting panel.