I already developed 3 screens, to my horror, it is all missing now.
As you can see from my log, I am editing it a few hours ago…
To replicate the issue, please take a look here: Apps | BMDP
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Hi @victor.tai, welcome to the forum! 
I'm sorry you've lost your progress, this must've been frustrating. Let's try using the _historyOffset url param to recover the state of your app.
For example, if the url to your app is https://subdomain.retool.com/mobile/editor/Paulo%20-%20Tests/test%20save
add this add the end: ?_historyOffset=1
Full url: https://subdomain.retool.com/mobile/editor/Paulo%20-%20Tests/test%20save?_historyOffset=1
If that still shows an empty app, increase the last value from 1 to 2, 3, and so on. We should be able to go back in history and find the last changes from before the screens went missing.
I was able to reproduce the issue from your screen recording:
After using _historyOffset=1:
After more testing, it looks like the bug only happens when the 'Tab bar' (navigation component at the bottom of the screen) is removed. We just created an internal bug report for this issue and will update you here when is fixed. To recover your app(s), you may need to use the _historyOffset url param increasing the value until you see the 'Tab bar' again. When you find it, make a small change so it becomes the latest, you can continue building from there without using the url param again.
I apologize for the inconvenience, and thank you for surfacing this!