If you only want specific views/grids to be editable, you will need to add Read-only Grid custom control for the views that you do not want to be editable. (yeah, I know it is a bit confusing)
1. Add the Editable Grid custom control at the entity level (which you already have done for Opportunity entity)

2. Open each and every view that you do not want to show editable grid. Click on Custom Controls and add "Read Only Grid"
PS: You cannot do it the other way round because there is no Editable grid control available at the view level. Hope it helps.

