“…Given the concerns around implicit learning, many have sought to develop recommender systems with explicit controls [25,36,42,57,65,77,80,86]. Users have reported higher levels of satisfaction [46,55], trust [80], and engagement [42,65] when they were given opportunities to exert control over the system, even when the controls had no impact on the output [7,110]. Examples of explicit controls include thumbs up/down buttons to rate recommended items [37,116], sliders and toggles for adjusting desired content characteristics [44], drag-and-drop topic specifiers [25], keyword critique [86], and manual selection of the recommender algorithm [9,28].…”