Question: gvim how to save font?
Answer: Note down the font name and font size from the "Edit-Select Font..." menu of "gvim. exec".
Then do :e $MYGVIMRC.
Search for "guifont" string and change it to set guifont=<font name as noted>:h<font size>
Save the file and quit.
Next time when you execute gvim. exec, you will see the effect.