How can I edit MasterHead width in Adobe Portfolio?

I have searched the web for this answer and everyone seems to have this same problem. Even if you align the masterhead to the left, the container is centered and has about a 70% screen width, so the content inside can't go any wider.

I have been thinking and this could be done by adding rich text maybe? but the template doesn't allow you to add one. 

I am using the Thomas template and I know it can be done because of these 3 examples:

https://jacobtejlmand.com/

https://robertlicau.com/

https://hellojohnolson.com/

This might have the simplest solution, but I have been searching and looking for this for about a day, so if anyone could shed some light, it would help me big time.

Thanks in advance 🙂