Web- You can use the pin feature to keep items on your timeline in view. Simply mouse over the items to pin and select the ribbon icon. Next, use the dropdown menu at the top left of the timeline to select "pinned" to see only those items that you have pinned. To return back to the full view of your timeline, select “all” from the same menu.
iOS- To access saved items on iOS, tap the dropdown at the top center of the screen and tap "my favorites”
Android- To pin items on Android, tap the pin icon at the bottom of the item. You can view pinned items by tapping the filter icon in the top right of your timeline and select "pinned."