Canon EOS R50 Mirrorless Camera (White) - Manual (Page 321)

Note
When ISO Auto is set, you can press the < > button to lock the ISO speed. After
locking during movie recording, ISO speed lock can be canceled by pressing the
<
> button again.
If you press the < > button and recompose the shot, you can see the exposure
level difference on the exposure level indicator ( ) compared to when the < >
button was pressed.
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