The Themes node (

) represents the appearance of the app. It contains the following settings:
Choose a style for the color theme from the Application theme and
Image export theme lists:
Default,
Light, or
Dark. The options have the same appearance as the desktop color theme preference options. Form objects that use the default setting for a color property let the desktop theme determine the color used. Form objects that have been defined to use an explicit color for a color property will use that color rather than the color used by the desktop color theme. You can use different themes for the app and the image export to, for example, make an app in dark mode but still export images in the default color theme.
From the Text color list, select
System (the default, as defined by the theme); one of the predefined colors; or select
Custom to choose a custom text color from the color palette.
From the Background color list, select a color to use as the background in the forms:
System (the default, as defined by the theme); one of the predefined colors; or
Custom, which make it possible to select a custom background color from the color palette.
From the Font list, choose a text font:
System (the default, as defined by the operating system) or another font in the list. You may need to choose a font that supports the characters in you local language. If needed, choose or enter a font size (in points) in the
Font size combo box. The default is to use the
System size for the font. By default, form objects inherit the font and font size from these settings.
Under Applies to new form objects, select any of the
Bold,
Italic, or
Underline checkboxes to make the text appear in any combination of a boldface font, italics, or underlined by default in form objects that you add to the form.