Hello, siewlan-tay.

I appreciate the screenshot you've provided. You can select the option Include inactive to show all inactive accounts on your Chart of Accounts (COA).

Here's how:

1. Go to your Chart of Accounts.
   
2. Click the Gear icon and select Include inactive.
   
3. Look for the inactive account and you'll now have the option to Make it active.
   

The following resources are good references to learn more in managing and organizing your chart of accounts:

• Manage default and special accounts in your chart of accounts
• Delete an account on your chart of accounts in QuickBooks Online

If you need further assistance in activating an account in QuickBooks, please let me know. I'd be more than willing to lend you a hand.