Hi there, B A,

You're unable to change the industry type once you've already set up a company file in QuickBooks Desktop for Mac.

You'll want to create a backup of your file, create a new company with the correct industry. Then, restore the file from there. I'm glad to walk you through the setup process:

1. Open QuickBooks. You’ll see the No Company Open window.
2. Click Get Started.
   
3. On the Create New Company page, enter information about your company, then click Next.
4. You’ll see the Choose your industry and chart of accounts window.
5. Select the type of business that comes closest to describing your company. QuickBooks creates all the accounts that have a checkmark.
6. This is our best guess for the accounts we think you’ll need based on the type of industry you’re in.
7. You can make changes if you like. If you make changes and want to go back to QuickBooks suggested accounts, click Default.

After that, you can restore the backup file to the new industry created above.

Don't hesitate to leave a comment if you still have questions. Thank you for posting and stay safe!