To undo the changes made by an action, follow the steps below:

On your dashboard, go to a particular item and click on the three dots. It will show a drop down menu, click 'View History'.

Upon doing so, it will display the list of activities or actions that transpired (eg. Made visible, Hidden etc). By clicking the eye icon, you will be able to see which product was the action made for. You will also see when the last update happened. 

And then say for example, if the product got hidden, you can 'Undo' that activity. To undo, just click the 'Undo' button. 

 

And then, you will see that the 'Undo' button is grayed out and changed the status to 'Undone'.

Another way to Undo changes is by clicking on the three dots in your dashboard (along with the particular action list). And click 'Undo Changes'.