Thank you for reaching out. It appears that you accidentally hit align center (horizontally). But don't worry. You may access document history and revert to the previous state. Please watch this short video to understand the procedure. https://www.youtube.com/watch?v=MgMq1uNX9Vw
Here is how you can select the previous version from Document history.
I hope this works.
Please update this discussion if you need further assistance.