If you activate the wrong checklist template in a project, you can follow these steps to get the template selection screen back. To do this, it will require that you have access to Edit Mode in the checklists, so you should have either the Supervisor or Project Manager role.
1. Go into the checklist module and activate Edit Mode
2. Start clicking behind each chapter, and select Remove
3. Repeat this for each of your chapters, turn off Edit mode, and click on + List.
4. Select the correct template from your organization.