View memories in Photos on Mac
Photos scans your photos and videos and gathers them into collections called memories. With Memories, you can rediscover special moments like a weekend hike, a visit to a friend or a first birthday party. Memories also shows you curated collections, such as your best photos of the year. And you can play Memory Movies — complete with theme music, titles and cinematic transitions — that you can edit and share. Photos creates up to three new memories every day (depending on the size of your photo library), and you can also create your own memories.
View a memory
In the Photos app
on your Mac, click Memories in the sidebar, then scroll to view memories.Double-click a memory to view its photos.
To see all photos in the memory, click Show More; to see just a summary of photos, click Show Summary.
Do any of the following:
Play a memory as a slideshow: Click the title image to play a slideshow. You can also select photos in the memory and choose File > Play Slideshow, then select a theme and music to play during the slideshow.
Play a Memory Movie: Click the Play button
on the title image to play a Memory Movie. Hold the pointer over the movie until the video playback controls appear, then click the Action pop-up menu 
and choose a mood and duration.Make the memory a favourite: Scroll to the bottom and click Add to Favourite Memories. To view your favourites, click Favourite Memories in the toolbar.
Change the name of the memory: Click the Info button
in the toolbar, then type a new name in the Info window. See who’s in the memory: Scroll down to People. Double-click a person to see more photos of that person.
See where the memory was located on a map: Scroll down to Places. Double-click the map to zoom in. Click Show Nearby Photos to show more photos from that location.
View related memories: Scroll down to Related to see more photos taken at a similar location or time, with the same people, and more.
Make a memory
You can create your own memories from an album that’s meaningful to you.
In the Photos app
on your Mac, select the album in the sidebar, then click Show as Memory.Scroll down to the bottom of the photos, then click Add to Memories.
Block a type of memory
You can block specific types of memories whose content you don’t want to see.
In the Photos app
on your Mac, click Memories in the sidebar.Double-click a memory that you want to block.
Scroll down and click Block Memory, choose the type of memory you want to block, then click Block.
To reset Photos to create blocked memories again, choose Photos > Preferences, click General, then click Reset Blocked Memories.
Delete a memory
In the Photos app
on your Mac, click Memories in the sidebar.Click a memory to select it, then press Delete.
Click Delete.
Only the memory is deleted; the photos remain in your library.