It depends on your Lemmy client. I only use Connect, so I can't tell you where it is in other apps, or if other apps even have it. (Settings -> Filters)
Connect is a simple app and has stabilized quite well over the last few months. Instance, community and word filters have been in the app since I started using it. (Instance filters were implemented long before Lemmy had that as a core feature.)
TBH, Connect was about as close to RIF as I could find at the time and it's been great. (It's had its share of bugs, but most are squashed now.)
Isn't it great? The m_sk spam was getting out of control here and I think everyone is sick of hearing about that other guy.
I gave it an honest shot to pay attention, in part, to that related news, but it's all the same shit. All humans will eventually get tired of a TV always being stuck on the same channel and eventually, it gets turned off.
However, there is method to the madness. If a person discards everything as trash, ie: Fake news, MSM, etc.., then they are more prone to believing lies directly from the source.