You can change the font for a specific text panel from the copy formatting tools when designing your campaigns.
The available fonts for Acteol SE are as follows:
Andale Mono
Arial
Arial Black
Arvo
Avant Garde
Averia Serif Libre
Book Antiqua
Calibri
Comic Sans MS
Garamond
Georgia
Great Vibes
Helvetica
Impact
Lato
Libre Bodoni
Lora
Montserrat
Noticia Text
Open Sans
Palatino
Playfair Display
Poppins
PT Sans
Raleway
Roboto
Source Sans Pro
Tahoma
Terminal
Times New Roman
Trebuchet MS
Varela Round
Verdana