This configuration variable determines how the runtime optimizes control resize requests. Prior to Version 5.2, the runtime would eliminate requests to resize a screen control if the new size and position matched the control's current size and position on the screen. In Version 5.2, or later, the runtime optimizes the control resize request using the the SIZE and LINES indicated (or implied) by the program. Setting OPTIMIZE_CONTROL_RESIZE to "0" (off, false, no) prevents any optimization of control resizing operations. The default of "1" (on, true, yes) enables the new behavior. See Appendix F "Changes Affecting Version 5.1" for more details.