This is the correct behavior. Previously you may have been accustomed to highlighting the patient in the search box on the left side. The old method was confusing caused problems attaching the incorrect chart to the message so we detached the right side from the left for clarity. The two side of the screen are mutually exclusive. When you are entering a message and you want to pull the chart you need to use the Patient button above the message box on the right side. That will preserve your message text and allow you to see the chart and also type in the message at the same time.
