I followed the wonderful example by Carmel Connolly (Making Other Work Harder in Survey123 Results — Esri UK)
to collate 'other responses' into a single field (Section 2), and it worked great..... except when i view the survey results in the Survey123 website. In the Analyze tab, i see a message which reads 'no questions are visible....' I clicked the Set Visibility button and selected the 'All' check box. Still no questions are visible. In the Data tab, when i click on an individual record, in the right hand pane i see the title of my survey and the 'submitted by' and 'submitted time' fields, but that is all.
As a test, i changed the hidden field to 'text', republished the survey, and submitted some new responses. Now i can see all the responses in the Analyze and Data tabs. Is the Survey123 site supposed to hide the responses to 'hidden' questions?