Cannot tell which window is active

[ShinoNia]

Hi
In the image, I can see that Archive Manager is being focused, Thunar is minimized. Firefox, xfce4-terminal and Discord have the same color but actually xfce4-terminal is active and the other two aren't.
I've played with the appearance setting but cannot solve the issue
May I change the color somehow to distinguish active windows and inactive windows, or somehow have a dot/line under active windows?
Sorry for bad English. Thanks in advance