[Theme: ElegantEstate] Remove Some Categories From Menu

Hi Everyone,

I am using elegantestate theme. These theme uses categories as menu at header. For example, if you have 4 categories like sport, music, cinema, book this means you have these four as menu at header.

My problem is;

I do not want to see music category at header menu. Moreover, I do not want to lose my posts which belongs to music category.

Can someone explain me what to do in which file?

thanks.