I am trying to search the memo field where I normally keep my PO number.

Welcome to the Community, @stephen48. I understand the importance of having to search for your transactions easily. 

Let me guide you on quickly searching for your PO number using Advanced Search. Here's how:

1. Go to the Magnifying glass icon.
2. At the bottom of the page, click the Advance Search.
3. Type in the PO number in the search field.
4. Hit enter.
5. You can further customize the page by clicking the Gear icon.

If the PO number still doesn't appear, we can try some basic troubleshooting steps to see if it's a browser issue. Sometimes, the cache of your search engine can cause problems when accessing websites or opening files. To start, open QuickBooks Online in an incognito window. This will prevent the use of your regular browser's history. Then, try searching for the PO number again. 

 Please refer to the following keyboard shortcuts based on your browser type:

• Ctrl + Shift + N for Google Chrome
• Ctrl + Shift + P for Firefox
• Control + Option +P if you're using Safari.
• Ctrl + Shift + P for Microsoft Edge.

If the private browsing session works, clear the browser's cache so the system can restart. This task can also be done in other supported, up-to-date browsers. Clearing the cache will remove any stocked cache causing the issue. 

Also, here's an article on recording, editing, and deleting expenses in the program: Enter and manage expenses in QuickBooks Online.

Let me know if you have more questions about your memo field. I'll be here to assist you. Have a great day!