How can I delete stuff from the Cloud
How do I delete unwanted photos from the cloud
iPhone XR
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If you are using iCloud Photos, when you delete them on your iOS device or computer, you delete them from iCloud as well. iCloud Photos is a syncing service only. Whatever you do on one device is reflected across all devices and in iCloud.
Set up and use iCloud Photos - Apple Support
What happens when you edit or delete photos
Your photos and videos are stored in iCloud in their original formats at full resolution. This includes HEIF, JPEG, RAW, PNG, GIF, TIFF, HEVC, and MP4 as well as special formats you capture with your iPhone or iPad, like slo-mo, time-lapse, 4K videos, and Live Photos. The photos and videos you capture with these devices are in HEIF and HEVC format. When you edit or delete photos or videos, it's reflected across all of your devices.