How can I change the color for the O in my APP Tic Tac Toe

I have been trying to change the color for the O, but I cannot do it. I did it in the X but there is no way that I can change the O.
Can anyone help me?

We need to see your Blocks Ilya.

Right-mouse click in the Blocks work area and select "Download Blocks as Image"

Hi Chris

Here they are

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