Just came across this issue today myself. Seeing as this isn't supported in Connect natively, I implemented a pretty simple workaround: an Experience Builder app with the Survey added to it.
Started with a blank full screen app, added an image and stretched to full size, then plopped in the survey (Survey widget in AGOL; if in Enterprise and that's not available you can still add a survey in an embed or iframe, whatever the widget's called).
I will be doing a bit more to this but here is the basic layout. Obviously this is a solution targeted at web browser surveys.