How do you follow threads? - eviltoast

On me my and third party apps on Reddit like Rif, sync all of them they have colored lines showing you the level of comments. Some are under a parent and some are just way off. How do you find what comment is referring to what? Has to be a simple way or am I just missing how easy it is outright?

I had a hard time in all Reddit apps I finally settled on rif with no lines but they had the parent next, previous