How to change heap memory size?

Where can i increase heap memory size so that i can see changed value in performance statictics of Application’s Administation menu item?

You can modify Tomcat Heap parameters in deploy/tomcat/bin/ and deploy/tomcat/bin/setenv.bat, as it a purely deployment setting.
See also: outofMemory: java heap space - #3 от пользователя krivopustov - CUBA.Platform