Can't edit quantity?

I feel like I'm missing something obvious but I'm not seeing any options to edit the quantity of items. In fact, that doesn't even show up as a column on my invoices even though I'm allowed to edit that category in invoice settings.

Just want to set up an hourly rate on the invoice instead of only showing the total.

Can you please more information about this one? So this one can be reproduced? Which version you are using?
No matter what the permissions you have, if you can edit that invoice you should be able to change the quantity as well.

Hi sorry for the delayed response, I've just been using the latest version via browser to do basic invoices. Under Invoice Settings, I have three columns set (Item, Price, and Quantity). When I go to the actual invoice, Item, Price, and Amount are the only columns that show up, and of those Item and Amount are the only columns with fields that I can input.

I'd post a screenshot if I could, but hope that made some sense.