Excel (mac) move between cells vs. move sheet

SHIFT + F14   –   standard key combo
or
Some configurations may need to work with :::  OPT + F14   or    COMMAND + F14

This will enable / disable the ‘Scroll Lock’ feature – which controls how the ARROW keys behave in MS Excel.
Scroll Lock – OFF :: ARROW Keys behave normally, moving between the selected cell
Scroll lock – ON :: ARROW Keys move the ENTIRE SHEET within the window