The color on my TV is too saturated and I can't find any way to adjust it. I don't see anything in the main settings menu and a few youtube videos I watched say to press the asterisk button during playback. When I do that, I only get "closed captioning", "sound settings", "wireless headphones", and "accessibility & captions".
Do you have a Roku TV or a Roku device connected to a TV?
TCL Roku TV and Roku streambar
You have to use the TV's remote to adjust picture settings. I assume you have the TV set to display the Streambar's input. Pressing * on the Streambar's remote won't get you to the TV's display settings, but you should be able to press * on the TV's remote at anytime to adjust the picture settings when it's set to the Streambar's input.