This question asks about bulk changing a font in Inkscape: How to change font of all the text in an SVG image at once using inkscape?
That works, but only on text with a font selected. Text with the default "sans-serif" font is not changed by the Replace Font extension.
Is there a way to replace all use of the sans-serif with a selected font?
Edit: I tried Billy Kerr's suggestion, but it didn't work. The font did not change. The dialogue looks messed up too.