How do I remove the sales tax column? This happened after the update.
This did not happen as a result of any recent update. The feature has been in the program for years. If you apply a tax code on any line item, the column appears and the tax code(s) is/are indicated. The column is necessary because different line items might be subject to different tax rates, in which case multiple tax amounts will be shown in the totals section.
The only way to suppress it is with a custom theme. But why would you want to? I don’t know Singapore’s tax law, but hiding this information might be illegal. (It would be in many jurisdictions.)