Add "Apply" button at the bottom of the facet selection window
Add another "Apply" button at the bottom of the facet section on the left of the Summon screen along with the current location (found at the top of the facet selection).
Users have a habit of not applying facets because they forget that they must apply the changes at the top. Typically most "apply" buttons are found at the bottom of filter/facet selections.
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Dom Benson commented
Could be both top and bottom.
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Anonymous commented
I came here to suggest this as well! We performed a usability test which showed that when the list of options is long, users did not know to scroll back up to the top to hit "apply" - a second apply button is needed at the end of lists in the selection window!