The
displays a dialog where you can search for all commands that are available in GIMP, even those that are not part of the menu. It is a quick and easy way to start a command if you don't know exactly where to find it.When you have not entered any search text yet, this window will be empty. As soon as you start typing, GIMP will show all commands that contain the search phrase you entered.
When you see the command that you are looking for in the list, you can double click on that command to start it.