Editing Estimates

Editing Estimates

Hi team, 
How do I delete line items in an estimate when editing it? I can't see any option to do this - no X, no trashcan, no drop down...

And how do I revert to the original estimate after cloning? I cloned to see if the option to edit were disabled in the original estimate for some reason, but the clone had no option either. Can I revert back to the original?

Cheers,
GC