When you add notes to a dashboard, you choose how large to make the notes box. In previous versions of the software, if there was too much content to fit inside the box, it would overflow outside of the box on the bottom.
If there was content underneath the notes box, however, this was a problem. As you can see here, it would overlap with existing content.
In version 2.9, notes stay within their box. If there is too much content to fit, the software adds scrollbars.
If you would prefer to see very tall notes rather than scrollbars, you can just make your notes boxes very tall to give your notes room to grow.