On UCI form, there used to be the button selecting sections, but the button has disappeared right after the update.
According to Microsoft support engineer, the feature of [Semantic Zoom] has been deprecated, so the button is also deleted.
When accessing UCI on phone, [Three Columns] section is displayed as vertically long [One Column] section, so the whole form page is displayed vertically long.
It is very convenient if the button is implemented again in order to display the top part of each section easily.