When zooming beyond 200%, the header and other content are truncated, making it difficult for visually impaired users to view the content in ArcGIS Experience Builder.
This issue is not reproducible in ArcGIS Experience Builder when the proper workflow is utilized. To configure the application properly, set the header's height as auto and use the font size in the 'vw' units. If the issue still occurs, contact Esri Support Services as additional information is required for further investigation.