Click on the miniOrange 2-Factor plugin and go to Login Settings tab.
Now, the checkbox of all the roles is enabled by default so if you want to disable two factors for any user role just unselect for the particular role.
Example: I have selected the checkbox for a particular user role namely Administrator, Author, Contributor, Subscriber.
Click on Save Settings button.
After this, whenever a user of selected role logs in to the WordPress site user will be asked for two-factor. And other users will log in normally.
Note: We are providing 2-factor authentication for 3 users in the free version if you want to add it for more user, please upgrade to the paid version.