Hi, amcd
Another option available is by clicking the Edit button
next to the tax field if you charge or liable to the combination of taxes
example HST Canada
Then if you select Tax Exempt / No tax from the tax column for each
individual line items then you won't get an opportunity to Edit/enter tax amount
in the total tax field. Check the screenshots.
Comment back for further clarifications.
Uninstalled and re-installed QB 2019 Desktop. The re-install gave me a different “write cheque” template that lets me edit sales tax.
Problem solved.