Changing Input Text Field Fonts

[SpaghettiCodeKing]

I seek to export a PDF containing input text fields with arbitary font. Is this possible?

Mint 20 Cinnamin
Scribus 1.5.7

If I create a new doc,
Add a PDF text field,
Right click on it, choose PDF Options > Field Properties
Select any font  from drop down menu (labelled PDF 1.3)
and
File>Export>Save as PDF
On Fonts tab > Embed All
Save

But the font does not change.

I don't know why the font setting is qualified with PDF 1.3

I don't know why the font in the saved pdf file does not change nomatter what font setting I use.

Any help appreciated