You can see every change that has been made to your landing pages via the Version history. Locate the 3 dots menu on the top right corner of the page editor to select it:
You can click on any version to see the changes made on the page, and restore the version via the 3 dots dropdown menu next to it. We will also highlight the change that was made for easier recognition:
Use the back and forward arrow buttons at the top of the editor to go back and forward through the changes you’ve made: