Canon EOS R5 C VR Creator Kit with RF 5.2mm f/2.8 Dual Fisheye Lens - Manual (Page 245)

Releasing Shutter without Card
You can set the camera not to shoot unless there is a card in the camera. The default
setting is [
Enable ].
1.
Select [ : Release shutter without card].
2.
Select [Disable].
245