In Paris, the user can click and drag up to a fixed height while in pre-Paris, TinyMCE editor can be changed to unlimited height.
There were some PRB fixes done in Paris for the TinyMCE editor which changed the behavior.
Add an attribute to any/all HTML fields on the dictionary record. The attribute is: "editor.max_height" and needs to be set to some large number.
1.Go to the dictionary entry of the field
2. Switch to Advanced View
3. In the Attributes fields, add editor.max_height and set it to a larger number. For example: editor.max_height = 3000.