I appreciate for following the steps above. I've replicate in my end and its working find. We need to make sure we click the pencil icon to show the empty box.
However, only Master admin and Company admin can only modify this setting.
Here's an article that you can read for more information about: User types in QuickBooks Online.
That's it. This should help you point in the right direction. Let me know if you have further questions in QuickBooks. I'll be here to answer them. Have a great day!