Describes the cause and action for error messages.
not giving option to merge cells
Merge and Center Not Available (Microsoft Excel) - Excel Ribbon Tips
How to Merge Cells in Excel in 2019 (+ Examples and Screenshots)
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2 Easy Ways to Merge Cells in Excel (with Pictures)
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Excel - How to Merge Cells
Merge and combine cells in Excel without losing data - Ablebits.com
Merge and unmerge cells - Office Support