V2018 has many very cool features. One of these is the way to filter just Direct Biditems and then not show Non-Additive items in Tree View. So if you have an estimate that has a lot of Non-Additive biditems you can filter your tree view to show only Direct Biditems or just show Indirects. If you have not tried filters before and have a lot of different type of biditem types then try this feature out and simplify your view.