You can easily remove a model from your account with a few simple steps.

First of all, you go to your studio dashboard.

Click the MODELS tab, as seen here.

That will show the list of your models

To the right of each model's details, you'll see a small head and shoulders icon.

When you click on that, it give you two options, one of which is Deactivate Model.

Click on Deactivate Model and you'll get a pop-up asking you to confirm the deactivation.

Press OK and you'll have deactivated the model from your studio. It will show as here.

That's it, you now know how to remove a model from your studio.