Tables are typically copied and pasted into a page or course from an external document. The table cells can be modified after being pasted into EthosCE.
Navigate to a course or page that has a table.
Click the "Edit" tab.
With the cursor, right click a single cell or highlight multiple cells and right click.
Click "Cell."
Click "Cell Properties."
Modify properties as desired. The alignment of the cell content can be adjusted here.