Click the Google Drive icon in your Mac’s menu bar → Settings (gear icon) → Preferences.
Click "Deselect all" at the top, then scroll down and check the box for Google Photos .
Click on “All photo albums included” to choose specific albums or leave it set to all.
Configure your export:
Hover over the first photo you want, then click the checkmark circle in the top-left corner. Repeat for all photos (hold the Command key to select multiple non-adjacent photos).