How To Change Default Font In Impress

I have searched the internet with this question, and several have replied, but I still have not been able to change my default font in Libre Office Impress. I’m not the brightest crayon in the box, so that’s probably the problem.
I’m sure there is a simple answer.

Thanks in advance for any help

Refer the details provided in this alternate forum post.

Also refer the answer here.

I finally got it!!