You need the 'Can Deactivate Own Forms' privilege on the project to deactivate forms you have created.

Similarly, you need the 'Can Deactivate All Forms' privilege on the project to deactivate forms created by other users.

Based on the privileges that you have, you can deactivate a form by following the below steps:

1. In the relevant forms listing area, navigate to the form that needs to be deactivated.

2. Right-click the required forms and select Deactivate Forms.

3. A layered screen appears. It asks you to confirm the deactivation of the selected form.

4. Click 'Deactivate' to proceed with deactivating the form.

Once the form is deactivated, you can view the deactivated forms by applying a filter for inactive forms.