Preconditions:
Type text in cells you want to use.
Steps to execute:
1. Select cells from precondition
2. Click on the Format menu
3. Click on the Read only cell
4. Click on the Format menu
5. Click on the Read only cell
Bug: The cells will stay Read only cells.
Please look at the video https://www.screencast.com/t/XjUwqql7L