How to change text orientation in a table cell
1. Place the cursor in the cell whose orientation you want to be changed.
2. Switch to the Table tab.
3. Tap Text Direction. (if you already have an inserted text which orientation you want to change, select it).
4. From the bottom sheet, tap the orientation you want for your text. 
5. Start typing.
Optionally, go to the Home tab to apply additional formatting to your text.