Yes, it is possible to customize the background color of a group or repeat section in the ArcGIS Survey123 field app for improved visualization on limited size devices. The group or repeat section is prominently displayed on the survey form when the background color is changed. For more information on customizing the survey form, refer to ArcGIS Survey123: Esri custom columns.
Use the following steps to customize the background color of the group or repeat section in the ArcGIS Survey123 field app.
Note: It is not possible to create a survey with a customized background color for a group or repeat using ArcGIS Survey123 web designer.
backgroundColor="#ffffff" or backgroundColor="White"
Note: Alternatively, click Settings > Style > Default (under any color field) to retrieve the HTML color code, and open the color chart. The HTML color code is located in the HTML field.
The image below shows the backgroundColor property in the body::esri::style column specified at the beginning of the group or repeat section.
The image below shows the group and repeat sections with customized background colors in the ArcGIS Survey123 field app.