To change the default action assigned to the Enter key:
- Open your spreadsheet
- Click on the orb button
- Click on Excel Options and move to the Advanced tab.
- Go to the "Editing options" section
- Check the "After pressing Enter,move selection" box
- In the Direction tab: expand the options and select "Right"
From now on each time you press the Enter key the cursor will switch to the right(adjacent cell)