When you perform any type of KEYWORD search in Horizon and there are more than 30 items returned, it only shows the first 30 items initially. The bottom of the screen will say “Retrieved 30 of 275” for example. If you want to see the additional items, you must click the RESUME button at the bottom of the search window. The next 300 items in the list will appear.
Related tip: do not Sort or Limit your results until you click RESUME and all items are displayed. If you do it before, the additional items revealed will not be included in the original sort/limit.
rev. 1/2018