How do I remove the quantity and rate column from invoices?

Good evening, @MMW3. 

Welcome to the Community! 

I can see how beneficial this could be for you and your business. However, these two columns that you listed aren't able to be turned off as they are part of the sales form. 

You can send feedback to our Product Developers so they can consider adding this in the near future: 

1. Go to the Gear (Settings) icon in the top right-hand corner. 
2. Press the Feedback option. 
3. Enter your suggestions. 
4. Tap Next to submit your feedback. 

I'm only a post away if you have any other questions. Have a wonderful day!