You can add your user as a Reports only user. This way, they can only view reports and unable to see actual transactions. Let me guide you on how to achieve this in your QuickBooks Online (QBO) account:
Go to the Gear icon.
Select Manage Users.
Click Add user.
Select Reports only.
Enter your new user’s name and email address, then select Save.
Then have your user to open the invitation email and click the Let’s go! link in the email to get started.