Under Chart of Accounts my main account that I use daily, that was always listed first, seems to have vanished. Any thoughts as to where I might find ?

I see that you're experiencing your main account disappearing from being listed first in the Chart of Accounts in QuickBooks Online, jmichalak53. I know the importance of having easy access to your daily-used account.   

On the Chart of Accounts page, you can click ↓ to sort the registers in descending order or ↑ in ascending order to show their sorted order. I've added screenshots for your reference.  

However, if you cannot locate the account, adjust the filters to ensure all accounts are displayed, or use the search bar to look through the lists of active and inactive accounts. 

In addition, if you're still having trouble finding your main account listed first in the Chart of Accounts after sorting orders, I recommend accessing QuickBooks Online using incognito mode. This can help eliminate any potential browser-related issues or conflicts affecting the visibility of the main account in your Chart of Accounts. To open an incognito or private browser window, you can use keyboard shortcuts:

• Mozilla Firefox: press Ctrl + Shift + P
• Internet Explorer: press Ctrl + Shift + P
• Safari: press Command + Shift +N

After opening the incognito or private browser window, log in to your QuickBooks Online account and check if the primary account is listed first in the COA. If it appears correctly, there might be a temporary issue with your browser or its cache. Clearing your browser cache and cookies or using a different web browser can resolve the problem.

I've included an article about using numbers in your chart of accounts (COA). This will help keep your records organized: Use account numbers in your chart of accounts in QuickBooks Online. 

Once everything is in place, you may use this resource as a reference for seamlessly matching your accounts: Reconcile an account in QuickBooks Online. 

If you have questions or need assistance managing your accounts in QuickBooks Online, please don't hesitate to contact me. I'll be here to help you out.