Board Thread:Support Requests - Getting Technical/@comment-31834342-20180421085622/@comment-24142930-20180421160855

A comment from a former FANDOM staff member on the talk page of the theme designer article said:

There isn't an easy way to create your own personal view of the wiki. You can modify your personal css and js file to adjust your look, but this can be a bit complicated.

I personally think if there was a way of setting personal themes, we would know about it. Your best option may be to ask some experienced CSS users for guidance in designing the look of your wiki for you personally.