Thank you for trying Darkest Dark. I’m sorry but we do not have the facilities to respond to issues that are not in English. If you can provide an English description of the problem, we will do our best to assist you.
I did try to translate the text and I see that you are reporting about the main menu background color in Dark theme. The menu bar background color is derived from the OS and I am afraid we cannot change it.
Apologies for inconvenience caused. Please let us know if you see any other issues.