in the toolbar and select the slideshow options you want.Make a memory a favorite
When a memory hits home, you can mark it as a favorite.
Click Memories in the sidebar.
Double-click a memory to view its photos.
Scroll to the bottom of the memory and click Add to Favorite Memories.
View favorite memories
Memories you mark as favorites appear in Favorite Memories.
Click Memories in the sidebar.
Click Favorite Memories in the toolbar.
Double-click a memory to view its photos.
Make a memory from a moment, collection, or year
You can create your own memories to highlight a moment or collection that’s meaningful to you.
Click Photos in the sidebar.
Click the title of the moment or collection to open it.
Scroll down to the bottom of the photos, then click Add to Memories.
Make a memory from photos in an album
Click an album in the sidebar.
Click Show as Memory.
Scroll down and click Add to Memories.
Block a type of memory
You can block specific types of memories whose content you don’t want to see.
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.
You can reset Photos to create blocked memories again. Choose Photos > Preferences, click General, then click Reset Blocked Memories.
Delete a memory
When you decide a memory is not for you, you can delete it.
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.