Through the buttons located at the top right of the tool menu, it is possible to move forward and backward in the changes made. The buttons are as follows:
How do they work? For example, if you have moved a text or enlarged an image, simply click on the left arrow to restore the modification. Similarly, if you wanted to go "back" again, you just have to click on the arrow to the right.
Below is a short demonstration mini-video:
WARNING: YOU CAN GO BACK AND FORTH IN THE CHANGES MADE ONLY IF YOU DON'T CLOSE THE BROWSER WINDOW YOU ARE WORKING IN. ONCE SAVED A PROJECT, IT WON'T BE POSSIBLE TO GO BACK TO OLDER VERSIONS.