Responsive design
Single column on narrow screens
Orbeon Forms supports responsive design for forms you create with Form Builder. The main aspect of this is that when your forms are shown on a narrow screen, for instance on a mobile phone, fields are shown in a single column.
[SINCE Orbeon Forms 2022.1]
The Form Runner Landing page is also responsive.
Example
If you have a form with a section containing a grid with two columns, on a desktop or tablet your form might show as:

When the same form is loaded from a mobile phone, fields will automatically be shown in one column to better fit that screen:

Limitations
The Summary page and Published Forms page are not yet responsive.
See also
Blog post: Responsive design
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