Are you unable to modify cells because they are locked?
Heres how to lock or unlock cells in Microsoft Excel 365.
FAQ
Why is Protect Sheet grayed out?
If its a shared workbook, Protect Sheet may be grayed out.
Unshare it by selecting Review > Share Workbook, then deselectAllow changes by more than one user….
Otherwise, multiple worksheets are selected.
Right-click any tab, then select Ungroup Sheets.
