Login to QuickBooks Online and look for the gear icon in the top right corner.
You then need to click on Account & Settings.
In the window that opens up, Click on Sales, and the on the pencil icon in the right corner of the Sales form content section.
When the sales form content opens up for editing, choose all the indicated options and click save.
Once done with the above, click the pencil icon for the Products and Services section.
Choose indicated options and click save.
You may then close this settings window by clicking on the X in the top right corner of the screen.