When watching TV with my Roku Express device the colors are off. There seems to be too much color compared to when I watch content from the same apps using the smart tv (Vizio). I've liked for color settings in the Roku but have not found anything.
There is no color adjustment on the Roku Express devices.
You will have to look into the TV settings for those. (use your TV remote, not the Roku remote). You may be able to set up different color profiles (custom) that you can toggle between when using your Roku and your TV native apps.
On some of the Vizio TV's you may find a "Picture Mode Edit" that you can assign to the different HDMI Inputs.
On other Vizio's may be limited or able to select some pre-configured options for the HDMI Inputs.
https://support.vizio.com/s/article/HDR-High-Dynamic-Range?language=en_US
https://support.vizio.com/s/article/Changing-Picture-Settings?language=en_US
https://support.vizio.com/s/article/Image-Quality-My-picture-doesn-t-look-very-good?language=en_US
Try checking your HDR or color depth settings in the Roku menu. Sometimes this helps!