Although I personally do not use the hide camera hole on my N20 Ultra it is a good option for many I agree and find it weird why Samsung would remove it from settings, display, and full screen apps !
I would suggest to send feedback to Samsung via the Members App about this and the other issues you've found @Cleo77
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.