When I copied code from one Main module into the actual Main module for the app, a green bar runs down the left side of the code window beside all the lines that I added. How do I get rid of this green bar?
This green bar means that the code has been changed and saved.
When you quit the IDE and restart it the bar will not be shown.
You may notice that when you modify your code a yellow bar is shown in the left margin of the modified lines.
The bar changes to green when you save the project.