Can I cancel the free trial? I selected Account and Setting and can't find Billing and Subscription menu on the left menu.

Yes. We can cancel it anytime, daehyun-noh.

Before doing so, let's run some troubleshooting steps to identify why the Billing & Subscription tab isn't shown. To start with, let's open QuickBooks on a private browser. This is the best place to isolate any browser-related issues on the opened pages.

I've added these keyboard shortcuts to open one:

• Google Chrome: Ctrl + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P
• Safari: Command + Shift + N

If you're able to see the Billing & Subscription tab, we can go back to a regular browser and clear its cache. A piled cache can also be the reason for some unexpected issues on a browser.

On the other hand, after the free trial, you'll be asked to enter your credit card details and proceed to your subscription. However, if you'll not enter them, it will be automatically canceled. 

I've added this article for more information when canceling the subscription: Cancel your QuickBooks Online subscription.

You always have me if you got other concerns. Stay safe!