Hi Auntie,
Thanks for using Microsoft products and posting in the community, I'm glad to offer help.
According to your description, it seems that you pressed " SCROLL LOCK (labeled as ScrLk)" key by accident, which will cause the entire worksheet to be moved when using the arrow keys, you can check the status bar in the lower-left corner in Excel to see if "Scroll Lock" is displayed: Move or scroll through a worksheet
To disable it, you just need to press SCROLL LOCK key again to inactivate it.
Hope the above information can be helpful, please feel free to let me know if it works.
Best Regards,
Arck