Hi there, @Julie128.

Thank you for following the steps provided by my colleague.

The reason why the Show Inactive Accounts option is grayed out because you don't have any inactive accounts in your Chart of Accounts.

For more information about the chart of accounts, refer to this link: Chart of Accounts.

If the issue persists, we need to check the condition of your company file. This would help us verify whether a data or program issue is. Before we do any of the troubleshooting steps, I'd recommend updating QuickBooks to the latest release. This would fix any minor program issues. 

After that, we can do the Verify and Rebuild process. This would identify the damaged components on your company file and fix them.

Let me know how it goes after contacting them or if you have additional questions about QuickBooks. Please know I'm always here ready to help.