I don't like the new sidebar on the website
What about the sidebar you don't like?
I think the header is prettier and the blue color is not my taste
Are the colors changeable? If not, you have a right to your opinion and if you don't like it, maybe change it or use a different theme? This side bar is pretty functional, it would be a shame for you to miss out on the changes just because you don't like the color.
I'll change it.
Yup, thanks for voicing your concern though. The more people that express their distaste, the more likely the devs will fix it and make it even better for you and others.