Brand fonts can be seen under the "Brand fonts" tab in the top left corner of the Icareus Studio Editor tool:
Adding New Brand Fonts to Icareus Studio
The new brand fonts can be added with the "Add font" button:
It will open a pop-up:
It shows the list of the fonts available on the system, which can be added to be "Brand fonts".

Notice that Icareus will upload the all the new fonts to server for security reasons, and those can be then used by organizations.
After the wanted font is selected and the user has clicked "Add", it will appear on the brand font menu:
Use of Brand Fonts
When the brand fonts are in use, only those will be available for end users when selecting the fonts for the text: