There is a "Following" tab which is supposed to be just tweets from those you follow (and things they interact with), compared to the "For you" tab which is cur

There is a "Following" tab which is supposed to be just tweets from those you follow (and things they interact with), compared to the "For you" tab which is curated by "the algorithm". I'm pretty certain there has always been a way to filter the timeline down to just people you follow.