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Optimize storage in Photos on Mac
If you use iCloud Photos, you can turn on Optimize Mac Storage to conserve storage space on your Mac. This option stores smaller versions of your photos on your Mac when storage space is limited, and keeps the original, full-size photos in iCloud.
Note: If you haven’t turned on iCloud Photos, see Use iCloud Photos on Mac.
In the Photos app
on your Mac, choose Photos > Settings, then click iCloud.
Select the iCloud Photos checkbox, then select Optimize Mac Storage.
To restore the originals to your Mac, just select “Download Originals to this Mac.”