highlighted cell includes next cell
 

When I click on a cell, the cell next to it or an adjacent cell is also
highlighted. How can I prevent this from happening and only have one cell
highlighted/active.

highlighted cell includes next cell
 

Are the cells merged?

Select the cell (or both cells)
format|cells|alignment tab
uncheck Merge Cells (if it's checked or shaded)

Bailey wrote:

When I click on a cell, the cell next to it or an adjacent cell is also
highlighted. How can I prevent this from happening and only have one cell
highlighted/active.

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Dave Peterson