Adding the spell check function to QuickBooks Online would be a great idea, scrplumbing918.
I'd recommend sending this to our Product Development Team by clicking the Gear icon and selecting Feedback. We always put your feedback into consideration for future product updates.
For now, you'll want to turn on the spell check function through your browser settings. You can ask assistance from your IT personnel about this. Feel free to search the steps online, too.
I'll be right here if you have other concerns. Have a great day!