On page 267 in the owner's manual, Canon reveals that the EOS R6 Mark II supports focus breathing during movie recording. The RF lens firmware updates released today support this feature.
Canon RF 14-35mm F4 L IS USM Lens firmware update version 1.0.3 is available for download.
Canon RF 15-35mm F2.8 L IS USM Lens firmware update version 1.0.8 is available for download.
Canon RF 24-70mm F2.8 L IS USM Lens firmware update version 1.0.8 is available for download.
Canon RF 70-200mm F2.8 L IS USM Lens firmware update version 1.1.4 is available for download.
Canon RF 70-200mm F4 L IS USM Lens firmware update version 1.1.1 is available for download.
These firmware updates incorporate the following enhancement: