Change all font family of a file

I’m looking to change all the texts of a figma file ( with multiple frames ).
I have a mixed typography, and am looking to replace all the texts for a different font instead of selecting them one by one.

I tried to select every object in my file by doing ‘‘CTRL + a’’. However now the text attributes is greyed out and there is something written : "click + to replace mixed content’’.
When I click +, it just zooms in.

What should i do to replace all these fonts in once ?

If you’re having trouble using the command on Figma's Quick Actions to select all with same text properties you could try using the Style Organizer plugin. It saved me more times than I can remember with these larger scale changes. See if it helps!