Why are fonts not rendered by WPF?

Question

Programming

Hello, I ran into this problem:
I want to use the "Roboto" fonts in the program, I added them to the resources, I designate them in the FontFamily,

but they are not displayed in the constructor.
But if you compile the program, then everything is OK:

How to make these fonts displayed in the designer?

Answer 1

I understood what was the matter.
Fonts with the property "Font embeddability = Editable" are displayed in the constructor, but any others are not.
Because I have a font file with the property "Font embeddability = Installable" then they are not displayed.

Answer 2

I can assume that your font is not standard and most likely for this reason it does not show changes, with standard fonts everything changes normally in the designer.