I just saved a PDF copy of the manual in the shared OneDrive folder, and the steps to change the frame rate are on page 79. At the top of page 80 is a note that you can't change the frame rate if you've set the camera to 60p or 35Mbps, and the description about video quaility settings on pg 56-57 seems to imply that you may need to change to AVCHD instead of MP4 to get the highest quality at 30P. PD handle both types equally well and I prefer the quality of MTS (AVCHD) clips to MP4 (I have two Canon Vixia HF S200s and a top-end HF G30).

Either way, bring the video quality down one step, than change the frame rate to 30p and go back to the video quality menu and see if you can get the highest quality in MP4 or AVCHD without changing the frame rate back to 60p.

The last note on pg 57 says that shooting in "baby mode" means that 60p is not available, but it seems that 35Mbps still is - so that might be how you have your cake and eat it too

YouTube/optodata

DS365 | Win11 Pro | Ryzen 9 3950X | RTX 4070 Ti | 32GB RAM | 10TB SSDs | 5K+4K HDR monitors

Canon Vixia GX10 (4K 60p) | HF G30 (HD 60p) | Yi Action+ 4K | 360Fly 4K 360°

I'll do some test recordings tomorrow. I changed the settings on the camera and the difference in quality is barely noticeable. I'll record a longer test tomorrow in perfect settings and tell you how the editor is behaving based on that.
I don't know your name. I want to really say thank you for being so helpful and patient!

It's Ron, and everyone here is happy to help when we can. Believe me, we've all been stumped at some point and found help here from someone who had the answer and a willingness to share

YouTube/optodata

DS365 | Win11 Pro | Ryzen 9 3950X | RTX 4070 Ti | 32GB RAM | 10TB SSDs | 5K+4K HDR monitors

Canon Vixia GX10 (4K 60p) | HF G30 (HD 60p) | Yi Action+ 4K | 360Fly 4K 360°

Hi optodata/Ron,
I enjoy reading your many helpful posts, thank you.
Dafydd