Thank you for posting the screenshots. I would recommend downloading the latest version of in5, version 3.8.4, installing that, and re-exporting.
If all of your content is still getting converted into a single PNG, check if the content in your InDesign layout is grouped and in the Advanced section of the Export HTML5 with in5 dialog (in5 > Export HTML5 with in5...) under Advanced Rendering, if Render Groups as Images is selected. If so, deselect it.
If you're still having issues after exporting with 3.8.4 and checking the groups rendering setting, we'd be happy to take a look at your InDesign file or a sample file that recreates the issue. You can send it to:
https://ajarproductions.com/pages/contact.php?category=in5