There is no undo

MIT App Inventor Help
1

Why is there no undo button or shortcut?

2

There is an Undo feature in the blocks editor (right click menu or CTRL+Z), but not in the designer.

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3

Yes, there is no undo in designer but is in block editor
undo

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4

But keep in mind, once you refresh the page or network disconnected I hope your undo function may not work. Untill you are active in the page it will work

5

To prevent accidental deletions, export the AUA file of your project frequently. If you suddenly deleted 10 components after exporting the AUA, you only need to import the AIA and finish up the 10 components.

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