The best practice is to use sans-serif fonts, rather than serif or decorative fonts. Sans serif does not have decorative lines. The fonts would include Arial, Calibri, Century Gothic, Tahoma, and Verdana. The font size should be 24 pt. font for the body text. The font could be larger depending on the audience or page layout.
Go to the "Slide Show" ribbon.
Select the Box Next to "Always Use Subtitles."
There are many settings under "Subtitle Settings."
Spoken Language Settings.
Selecting the arrow will show all the languages options that you will be speaking during the presentation. These are the languages they can be selected for the speaker’s language.
Subtitle Language Settings.
Selecting the arrow at the end shows all the languages that can be chosen for the subtitles that will come up. There are many more languages that can be chosen from.