How to change BG color in this video template?

Hi there.
I downloaded this template and started editing.

I followed the instruction in the video which is included in a same folder but I cannot change the background color.
The BG colors are just red even I changed to different colors.

This screenshot is from the tutorial video included in the folder.
Here the colors in composition panel follow the color setting in “effect control” panel.

And the screenshot below is my After Effects.
In my case,the color setting in effect control panel doesn’t influence the colors in composition panel.
I intentionally made all colors in effect control green or blue but the colors in composition panel are still just red.

I looked for the reason for several hours but I couldn’t find the solution.

Could anyone tell me how to solve this problem?
Any suggestion is super appreciated.

My computer is Macbook Pro 2012 (Middle),Mojave 10.14.6
2.9 Ghz Intel Core i7
Intel HD Graphics 4000 1536MB

Best regards