Browse your photo library on Mac
You can browse the library in the Photos app to view your entire collection of photos and videos.
View your library
Go to the Photos app
on your Mac.In the sidebar, click Library.
Do one of the following:
See all photos: Scroll to see more photos.
See photos from a specific time: Click Years or Months in the toolbar.
When you view your library by Years or Months, you see a summary of the best photos. To see all the photos, click All Photos in the toolbar.
Change the library display
You can change the size and appearance of the photo thumbnails in the photo grid, and manage the content displayed in your library.
Go to the Photos app
on your Mac.In the sidebar, click Library.
Click All Photos in the toolbar, then do any of the following:
Increase or decrease the size of photo and video thumbnails: Click
or 
in the toolbar.View photos as square thumbnails: