Entries can be marked as Favorites to be searched or filtered to quickly identify special entries.
Swipe on any entry in the Timeline view and tap the More (•••) icon. Then tap Mark as Favorite. A heart icon will appear in the metadata line at the bottom of the entry.
You can also do this within an entry. While in Read mode, tap the More (•••) icon at the top right and tap to Mark as Favorite.
Then you can use Filters to quickly sort and view all of your Favorites in the Timeline view.
This is currently represented by "Star" but will be updated as Favorite in an upcoming update. Right-click (Control+click) on any entry in the Timeline and choose "Star".
Inside an entry, click the Star icon at the bottom of the entry.
Tap to open any entry. Tap the More (•••) icon at the top right and choose to Star the entry. This will also be changed to Favorite in the future.