An employee left our company. I am logged in as the primary user. How do I reset the user's password, or prevent the user from logging in without deleting the account?

Hi there,

Glad to have you join the Community. I'll be happy to guide you on the right path so you can achieve your QuickBooks goals with ease.

Based on the info you've shared, I recommend deleting the user as doing that prevents the user from accessing the account again: 

1. Go to Settings ⚙, then select Manage users.
2. Select the ellipsis icon on the user you want to delete, then select Delete.
3. Select Delete user from the pop-up window to confirm.

Give these steps a try and let me know how you make out. I'll be a message away.