I can help you with the expense categories to show in your Chart of accounts in QuickBooks Online (QBO), Jess.
Let's start with opening your QuickBooks Online account in an incognito browser. Using Private windows, won't store any history or form of data, which can cause some missing accounts in the Chart of accounts. This will help us identify if this is a browser-related issue.
To save you time, you can use either of these shortcut keys:
Mozilla Firefox: press Ctrl + Shift + P
Internet Explorer: press Ctrl + Shift + P
Safari: press Command + Shift +N
If it works fine from there, switch back to your regular browser and clear its cache. If the issue persists, you can use other supported browsers as an alternative option.