Permanently substitute all fonts in an Impress document with e.g. ´Arimo´

[taleman12]

I use LibreOffice 25.8.
How can I substitute all used fonts in a .odp file (direct formating or not) with e.g. “Arimo”? I want to replace used fonts in every .odp file I have created during the last 10 years.

There is no “format” button within find & replace…