In a previous R-release, we added two new automatic themes to define font and the font size, so there are three automatic themes at your disposal which respect the guidelines of each platform. To design your interface, the automatic theme is the recommended way to go with each form object using the font and size recommended by the OS.
In some cases, you may need more control and have valid reasons to ignore the guidelines. With 4D v18 R3, you can override the size of the automatic themes and have more control over how your text is displayed.
Select an automatic font theme in the Property List (normal, main, additional) and 4D will suggest the “automatic” font size. When the form is executed, these two properties will be calculated according to the platform. There’s no change in behavior from what you already know.
If you want to use the system’s default font, but with a font size of 24 for titles, it’s very easy. Choose the “Normal” theme, then change the font size to 24.