Where you select the "Data Load Editor" from the menu, use the icon to the right of the menu option. This opens the Data Load Editor in a separate window. This then means you can swap between your editing window and the data load windows very quickly and easily. So you will always have quick access to the "Load Data" button.
You can even pull out the Data Load tab to a totally new window which you can have on a second desktop or similar so the "Data Load" button is always visible and usable.