This was a recent feature added to the PF Community sheet. For existing sheets(prior to the 1.722 update), you can manually add "{{scroll_desc=@{scroll-desc}}}" into your macro-text or you can delete/reset an entries macro-text. The new property for adding a scrollbar to long descriptions will be included as the default macro-text. Note: While this is perfectly safe for most people, beware that if you have manually edited the full macro-text of the entry, you will loose those edits if you delete/reset the field. So, you may want to make a copy of any of those special macro-text text fields to help with customization if your reset. New sheet's will include the new macro-text for scrolling long descriptions automatically. We've had issues in the past auto-editing/updating existing macro-text fields that included user customizations. To prevent anyone from possibly loosing their edits, this was the safest method. I may still include code in a future update to handle existing macro-text, but for now resetting the field or manually adding "{{scroll_desc=@{scroll-desc}}}" are the current methods. Apologies for any inconvenience.