In ArcGIS Online Open Data site, set up the configuration view so that it is a What You See Is What You Get (WYSIWYG) when compared to the Home Page view.
Last Published: August 17, 2015ArcGIS Online
Bug ID Number
September 15, 2014
March 30, 2022
After review by the development team, it has been determined that this issue is related to a known limitation with the software that lies outside of Esri's control. The issue's Additional Information section may contain further explanation.
In the framework we use for the site builder, this functionality is too hard to get just right. However, one can use custom HTML/CSS