Canon EOS R6 Mark II Mirrorless Camera with 24-105mm f/4-7.1 Lens - Manual (Page 310)

2.
Set the focal length.
Turn the < > dial to select the digit of the focal length.
Press the < > button to display [ ].
Set a value, then press the < > button. (Returns to [ ].)
3.
Select [OK].
Caution
Set [ : Release shutter w/o lens ] to [ Enable ]. [ Disable ] prevents image
stabilization.
[
Focal length ] is not displayed when lenses are attached that support lens
communication.
Note
Focal length can be set in a range of 1–1000 mm (in 1 mm increments).
310