I do appreciate your time in performing the steps provided by my colleagues, Rob357.

I suggest reaching out to us so we can further investigate why you're unable to see the expense costs in the project reports through one of our supported browsers. Once you'll get in touch with our Phone Support Team they'll reach out to our engineers and find out the root cause of this issue. 

The steps are laid out by my colleague on how to contact us. You can also use the link on how to reach out to us: QuickBooks Online Support.

Keep me posted if there's anything else that you need help with. Take care!