We only provide support for using the features of our product.
Creating a Child Theme is customization.
Regarding customization, we can only provide css code.
If you need help to create a proper Child theme, You can contact us for customization service via https://theme4press.com/theme-customization-service/
Regarding your question.
I need to know if Evolve Plus works properly with child themes.
Yes, If you are a programmer and can create a proper child theme.
And If that question is directed personally to me. Yes, I can create one that works with Evolve Plus Theme.
Please see my screen-cast which shows me creating a child theme for Evolve Plus theme in less than 1 minute.
And as I mentioned before, there is no way a child theme can affect the Theme Options, unless you add code to modify it.
In my screen-cast, you can see, I am able to change the menu color without any issue.
Hope the above clarifies all your doubts.