You have to edit the template files of the client portal you are using. You will want to copy the entire folder and re name it. Example.
cp metro metro_fh
Then edit the files in metro_fh.
Once you get it the way you want it set that theme in general settings
Also if you are using the latest 2019 theme they have added a template editor. Not sure if that would do this or not. Havent experimented with that one. Assuming your license is current.