How to make a grid read-only?

I have headerless detail form with a grid and a button. Here's what I want

1. After users upload (copy/paste) data into the grid using the Import Assistant screen, I don't want users to be able to update the data. Right now when I click on a record in the grid then it turns into an update mode. How do I make it so it's read-only

2. I have a button up on the top of the grid to process some logic when they select one or many records in the grid and click this button. If I make the grid read-only, it's still possible to do this functionality right?

Thanks

JDE 9.1