To merge multiple table cells:

1. Double-click inside the table.
2. Click on a table cell.
3. Hold down the Control key (Ctrl) on your keyboard and click on each additional table cell you would like to select.
4. Select Merge Table Cells from the Table menu.

Tip: If the Merge Table Cells option is not available, the selected table cells most likely don't line up. It is only possible to merge table cells that are part of the same column or row.

Step 1:

Step 2:

Step 3:

Step 4: