How do i delete photos from iphone Xr and NOT from iCloud library/MacBook

iCloud Photos is a syncing service. Any photo you delete from a device where iCloud Photos is turned on will also be deleted from iCloud and from any other device connected to iCloud Photos. You can potentially reduce the storage space required on a device by turning on Optimize Storage. See: https://support.apple.com/en-us/HT204264

Apple does not currently offer cloud-only storage for photos. If that is what you want or need, you may want to explore 3rd party options such as Google Photos or Dropbox.

Another way that photos may be on iCloud (if you don’t have iCloud Photo Library turned on) is via a backup of an iOS device. The only thing you can do with a backup is use it to restore a device or set up a new device. The contents of backups are not viewable at iCloud.com and if you delete a photo from a device it will not be included in future backups and will be lost.

If you want to turn off iCloud Photos on your iPhone, see the "How do I turn off iCloud Photos on only one device?" section of Get help with iCloud Photos - Apple Support

If you are using the iCloud Photo Library, this is not possible.

iCloud is a syncing service, designed to keep your content the same on any subscribed device. It is not off device storage.

You will need another cloud service for off device storage.