All my suppliers have disappeared. When I try to input an expense only my customers appear.

I understand this was challenging for you, @mrsparky. You have me on your back to solve this issue you encounter while handling your suppliers in QuickBooks Online.

Before proceeding, did you encounter a specific error message? This will allow us to further check if there are any ongoing issues within QuickBooks Online.

Furthermore, we can use an incognito window and sign in to your account there. If this option works, we can clear the cache from your regular browser.

Here are the shortcuts to incognito browsers:

• Google Chrome: press Ctrl + Shift + N
• Microsoft Edge: press Ctrl + Shift + N
• Firefox: press: Shift + CTRL + P

Plus, the cache can hamper and affect the functionality of QuickBooks and result in missing tabs and features, and clearing the cache to reduce issues when using QuickBooks.

I've included a few articles for more information that will help you keep track of your supplier transactions in QuickBooks Online: View supplier transactions.

I'm here to help with any further questions you may have about QuickBooks or any other topic. Feel free to reach out whenever you need assistance. Take care!