Top Task Bar (File.. Edit.. Lists..Command Centres.....etc)
EDIT
In the Drop Down list move 'Don't Record / Delete Sale' to sit below 'Delete Line'. I have a number of very busy frustrating occasions scrolled down quickly and released on 'Don't Record / Delete Sale' resulting in the invoice or quote DELETED!!!!
Whilst I should be paying more attention surely the list can be quickly tweaked as per above suggestion as it is a less aggravation to accidently delete a line than the complete invoice / quote!