Using the subroutine list - hakakou/optiperl GitHub Wiki
The subroutine list at menu Search / Sub list is a simple dialog containing all subroutines in the edited script, and is used for navigation. Entering a part of the subroutine's name will narrow the search in the sub list, where you can then select the sub using the up / down arrow keys and Enter. The editor will focus on the subroutines declaration.
You can also copy the subroutines name into the clipboard and exit by pressing Ctrl-Enter, without changing were the cursor position was. This is helpful if you were trying to remember how the subroutine was called.
Learn to use and get in the habit of using the subroutine list. It will increase your productivity!