Using the Table Tools Menu

Select the cells in the table that you want to merge. This action highlights the selected cells and activates the Table Tools menu in the Ribbon. Click "Table Tools" and choose the "Layout" tab. From the Merge group, click “Merge Cells” to combine the selected cells into a single cell.

Using the Context Menu

Alternatively, a quicker option is to right-click the selected cells in the table that you want to merge, to launch a context menu. Select "Merge Cells" from the context menu to complete the task.