The Chronicall Properties window can be accessed by navigating to Chronicall's installation directory on the Chronicall server (usually C:\Program Files (x86)\Xima Software\Chronicall), then to tomcat\bin. Right-click on chronicallw.exe (note the w in the name) and run it as an administrator.
From here, you can modify some of the Chronicall service's advanced settings, including Java's memory limit. Most users will not need to access these settings unless directed to do so by Xima support. Use the System Settings within Chronicall for most administrative tasks.