Thanks for reaching out, @jef846.
We recommend checking the "Recent channels" feature to limit the list of channels that appear in the Live TV Channel Guide.
Check out this link for more info: How do I find TV listings using Live TV Channel Guide? - Roku
Please let us know if there's anything else we can help you with.
The link you provided is not accurate from my experience. I have three (3) TCL Roku TV's that have updated to Roku OS Version 10. The original blog post and your support link posted state that with OS Version 10 there is an option to view ALL CHANNELS, RECENT CHANNELS or FAVORITE CHANNELS. I have not found an option through the menu system or within the LIVE TV GUIDE that allows you to create a list of FAVORITE CHANNELS. There are only two VIEW options in the LIVE TV GUIDE. They are ALL CHANNELS and RECENT CHANNELS. No FAVORITE CHANNELS view is available.
It still baffles me why Roku removed the ability to mark channels as favorites way back in OS Version 6 or 7. Why would you not allow your customers to create their own FAVORITE CHANNELS list? Why is there a reference to the ability to create FAVORITE CHANNELS in your support post link above and in the blog announcement for OS Version 10, but it doesn't appear to be available? Is this ability to create a list of FAVORITE CHANNELS limited to only select models of Roku TV's?
BenQ HT2060 4LED Projector | ONN 5.1.2 Dolby ATMOS Soundbar | FTV4K MAX
TCL Roku-TV 55P605 (4K/HDR/DV) | VIZIO SB36512‑F6 ATMOS Soundbar | FTV4K MAX
TCL Roku-TV 43S425 (4K HDR) | FTV4K MAX
TCL Roku-TV 32S301 (720p) | FTV4K MAX