It seems I misled you with the iMacros suggestion… They’ve apparently reigned back in a bunch of the features on the previously-free product. I went down a rabbit hole of trying to setup the old version via Firefox portable apps and in a VM but eventually gave up on iMacros.
I used a different tool though called Katalon and just made a script to handle bulk deletion for people in the future.
This video shows it in action:
And here is the tutorial that shows you all the steps to make it work: https://grid7.com/2020/06/browser-automation-katalon-studio/
I put the script in Github for anyone else who is confronted with this task in the future: https://github.com/scrollinondubs/adalo-bulk-delete
And I made a video on the blog post above of the steps necessary to build and execute that from start to finish. Browser automation is a really powerful skill to acquire as it saves you in scenarios like this one. Anyways glad you got it resolved and hopefully this is helpful anyone else in the same boat.