Why doesn't the taskbar color change?

Question

Windows

Hello! I want to change the color of the taskbar, but there is no such possibility. Worth white, no way to change.

I used to put all sorts of programs for decoration, but I deleted everything.

ps the task registry does not help (set the value to 1), in fact it can be set in the settings.

What's the solution? I searched in Google, it does not help - I tried (