Adding an item using the SKU is still possible, ben100.

You'll want to try the workaround I've shared above. Though not in the SKU field, we can enter or search it in the Product/Service field.

Also, the changes made on the Custom Form Styles will reflect only on the form itself. If you want to remove the service date when creating an estimate, you can turn it off in the settings page. Go to the Gear icon and select Account and Settings. From the Sales tab, click the edit (pencil icon) on the Sales form content section and uncheck the Service date. Once done, select Save and Done.

I understand that there are limitations in QuickBooks Online. Allow me to send feedback to our developers so they can consider adding more features and options in this version.

I'll be right here of you have more concerns. I'm all ears and ready to help.