It is not possible, as far as I can see, to change/customise the columns that appear on the add line item UI - I can see what that would be desirable however. I suggest you post it as an idea in the ideas forum so that other users can vote to show their support for it as a feature request: https://community.hubspot.com/t5/HubSpot-Ideas/idb-p/HubSpot_Ideas
It is not possible, as far as I can see, to change/customise the columns that appear on the add line item UI - I can see what that would be desirable however. I suggest you post it as an idea in the ideas forum so that other users can vote to show their support for it as a feature request: https://community.hubspot.com/t5/HubSpot-Ideas/idb-p/HubSpot_Ideas