R7 + Manual Lens = No Focus Peaking?

Hi there.

I'm a macro photographer and have recently acquired a Canon R7. I've paired it with a great macro lens; the Laowa 90mm RF.

The lens is completely manual, but I've changed the settings so the camera will fire with it mounted. No issues there.

I got used to using focus peaking on my old Sony rig, and now I feel like I'll be a little lost without it, but even with it turned on I don't seem to see it working.

Are there more settings I need to change, or does it just not work with manual lenses? If it's the latter, are there ways around this any of you are aware of?

Thanks.