Hello
if you want to keep all of them in one line then you will have to put all the menu options in a sub menu, if you put more menu option in same line then it will come in two lines only doesnt matter what you do.
which font color do you want to change? all of the color options are in the customizer.
please refer to our theme documentation https://luzuk.com/demo/gurukul/documentation/
thank you