
Merge or unmerge cells in Keynote on Mac
Merging table cells combines adjacent cells into a single cell. Unmerging cells that were previously merged retains all the data in the new top-left cell.

Here are some restrictions:
- You can’t merge nonadjacent cells or cells from different areas of the table—for example, cells from the body and the header. 
- You can’t merge columns or rows. 
- You can’t split a cell. If a cell has never been merged with another cell, it can’t be unmerged. 
Merge cells
- Go to the Keynote app  on your Mac. on your Mac.
- Open a presentation with a table, then select two or more adjacent cells. 
- Control-click the cells, then choose Merge Cells. - Note: If the Merge Cells command is dimmed, you might have selected entire columns or rows, or a header cell and a body cell, which can’t be merged, even if they’re adjacent. - These are the results of merging cells: - If only one of the cells contains content prior to merging, the merged cell retains the content and formatting of that cell. 
- If multiple cells contain content before merging, all the content is retained, but cells with a specific data format, such as numbers, currency, or dates, are converted to text. 
- If a fill color is applied to the top-left cell, the merged cell takes on the fill color. 
 
Unmerge cells
- Go to the Keynote app  on your Mac. on your Mac.
- Open a presentation with a table, Control-click the cells, then choose Merge Cells. - All of the content from the previously merged cell is added to the first unmerged cell. 
Merged cells are treated specially in formulas:
- Refer to the cell directly in a formula by using the address of the merged cell’s top-left corner (for example, C3). 
- You can’t include only part of a merged cell in a cell range that’s used in a formula. 
- If you refer to a cell in a formula, then merge the cell with cells that are outside the formula’s intended range, the formula may result in an error.