Allow displaying children items without also displaying the parent items

Please allow displaying children items without also displaying the parents. For timeline with lots of grouped events, the compact layout is illegible due to all the children events being forced to stay within their respective parent events. With this feature, users can choose to, for example, tag the parent items they don’t want to see and filter them out of view.

(I am not the only one interested in this feature, since the same was asked about in this question.)