Hi @bluebirdbox-io,
We are so sorry Sarabun Font is not available in the Font list. These are the new fonts added by Google. We will update this as well as other Google Fonts in the list in next version update. If you need it currently then just go to theme main directory -> inc -> customizer.php and go to line no:618 and you will find the below line of code:
"Sansita One" => "Sansita One",
underneath this code just paste the below one:
"Sarabun" => "Sarabun",
and save the file and you will have this font in the list.
Thank you!
.
.