Hi,
To edit the screenload script, go to Operator>Edit Screen. Click the name of the screen at the very top of the screen tree manager. In the bottom, in the Properties section, click on the small Events tab (button with a little lightning bolt). The first item on that tab is the Screen Load Script. Click the button with '...' to open and edit that script. You can use Ctrl+F to search for the function you are looking for. As always, I recommend saving your screen with a unique name after changes are made, rather than altering the default screen set. To save your screen with a new name, go to Screen>Save Screen As.
Best wishes,
Bryanna