On a 'Task Board' (your checklists, tasks, etc.) you can now set the template to 'Lock changes on items imported from collections'. When you do this, the imported checklist items and tasks included in your 'Pre-Plan / Play' will have their title, order, and list locked. This will stop users from being able to modify or delete your well planned checklists during an incident.
Are you an administrator? Read the help docs for setup instructions.
When you set a Task Board Template to have 'Lock changes on items imported from collections' enabled, you can also select any field to add it to the locked list. This is really useful for adding content into your Collections such as Task Instructions, Phone Numbers, Sub-Items etc. which you want the user to have as an aid when completing the task. (Top Tip: Any phone numbers added in E.164 format will be clickable to dial from your computer).