How to disable the transparency of the panel

I just found that the panel is a little transparent when I am editing. I though something went wrong with my laptop display screen. While, finally, it’s just wallpaper color shown on the panel.
屏幕快照 2022-04-13 下午9.32.31
屏幕快照 2022-04-13 下午9.32.38

Choose Apple menu > System Preferences, click Accessibility , click Display, click Display, then select “Reduce transparency.”

It will reduce all the Windows transparency.

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