Group albums in folders in Photos on Mac
You can create folders to group your albums. For example, you could create a folder named “Family Photos” and put all the albums of your family events into it. You can also create folders inside other folders.
In the Photos app on your Mac, click My Albums in the sidebar.
Choose File > New Folder.
Type a name for the folder.
Drag albums into the folder.
Tip: To quickly create a folder, Option-drag one or more albums onto another album. Photos places all the albums into a new folder. You can also drag other albums into the new folder.
To remove an item from a folder, Control-click the item, then choose Move Album Out Of [folder name]. To delete a folder, Control-click the folder, choose Delete Folder, then click Delete.
You can’t move shared albums into a folder.