Canon EOS R3 Advanced User's Manual page 171

Minimum Shutter Speed for ISO Auto
To prevent shutter speeds from being set too low automatically, you can set the minimum
shutter speed for ISO Auto.
This is effective in [ ] or [ ] mode when shooting subjects in motion with a wide-angle
lens, or when using a telephoto lens. It can also reduce camera shake and blurred subjects.
1.
Select [Min. shutter spd.].
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