I don't want "Photos" on my iMac
I have a brand new iMac that I've been really happy with until today when I kept getting the message that the system storage was to full to be running applications and I realised that Photos was using up 103GB! I went to my iCloud settings and turned off Photos under "Apps on this Mac using iCloud". But the photos are all still there. I don't want them stored on my mac. Most of them are stored on iCloud in my iPhone and I want them on my iPhone only. I find the Photos app on Mac to be horrible and have never had the need to grab photos from there. I usually just use airdrop. I'm afraid of deleting the photos in the Photos app because I don't want them gone, just not stored here. I wish I could just delete the photos app, can anybody help me to free up these 100GB of photos with out deleting them completely and still having them accessible on my iphone? Thanks.
iMac 27″, macOS 10.15