Two additional functions were also added after I completed the above (Mute user forum-wide [ie: all user posts/replies are muted in all threads] and Block User (user is muted and also cannot see your posts forum-wide) which you'll also see listed.
USER FORUM MUTE OPTION:
You can now
mute someone forum-wide and it will completely remove them. This will
hide their posts and/or interactions in other threads. It works the exact same way it does in a normal thread mute. You just won't have to select it as you move around in each thread.
You can select them here:
However,
you will see threads they start, which will appear as normal. But
if you click on the thread, they won't be there. You also won't see any of the posts replying to them, so it's basically like they won't exist no matter what thread you're in.
USER FORUM BLOCK OPTION:
(This not only hides the user's posts but also blocks them from seeing your posts.)
The next option is the ability to block a user using the "Forum Block." This not only
completely removes that user across the board the way the Forum Mute does, but it
also blocks them from being able to see your posts.
Not only that, but it
will also hide all of your quoted replies - even to other users - from them and vice-versa, so
it's literally like you won't exist to them, and they won't exist to you.
Still, as mentioned above, you will see threads they start, but nothing they post/reply to will be visible.
Nor will they be able to read your posts or the replies by anyone else to you.
If you don't want to see any notifications, you can also put the user on "ignore."