excel issue

[xeven_]

I am using excel in this office 365, not sure if it is technically excel 2016 or what. I have a long string of numbers and when I highlight and scroll with the objective of getting the numerical count it is deleting my data in the first selected cell and attempting to add it to the last selected cell. I do not want it to do that is there a way to turn this very annoying feature off!?

 

[JonXL]

I think hitting F2 will toggle the mode (at the bottom left where it usually says 'Edit').