Use document protection to block entire documents or parts of documents from being changed. Document protection can be used in text templates (e.g. invoices), lists or mail/email.
Click on the expand triangle next to Lock in the toolbar and select Document to lock the complete document and forbid editing.
The icon changes to and the document is now locked for changes.
To release partial areas for changes, select the area and click on > Unlock document. Note: Use Unlock document only by users from group to authorise one specific user group to edit the document.