If you have set aside a patient, or opened a particular study, they appear in a patient tab in the navigation bar along the bottom of the Image area. All open studies stay open until you close them, even if you log out of IMPAX. When you log back in, the open studies are still in the patient tabs in the Image area.
To close all studies for a single, open patient
At the bottom of the Image area, right-click a patient tab and select Close.
To close all open patients and their studies
At the bottom of the Image area, right-click a patient tab and select Close All.