Quote from BurningFish
Or you could create a custom "unfinished"-list, if you put the manga on that list, then you'll have the blue circle next to the name. For example I have a list called Beware! for that. I usually don't check those manga, because I know, that I only put manga on that list that I don't want to ...
This is what I do. I have a custom list of "not interested" and use the "unfinished" status. If I see a blue dot next to a search result, it's most likely because that title is on that list.