When a whole board is finished, locking the tab protects everything on it at once, rather than locking elements one by one. A locked tab becomes read-only: you can still look at it and switch to it, but nothing on it changes until you unlock it.
Locking and unlocking a tab
Right-click the tab in the tab bar (or long-press on touch) to open its menu, then choose Lock tab. The same item reads Unlock tab afterwards, so it toggles the tab back to editable. A locked tab shows a small padlock in the bar so you can tell at a glance which boards are frozen.
What a locked tab protects
While a tab is locked, its whole canvas is read-only:
- Elements can't be moved, resized, or edited.
- The eraser skips everything on the tab.
- The tab's content can't be cleared, and the tab itself can't be deleted until you unlock it.
You can still rename or duplicate the tab from the same menu, and duplicating gives you an editable copy if you want to keep building from a locked original.
When to use it
- Freeze a signed-off or presented board so a later edit can't disturb it.
- Protect a reference or template tab you copy from but never change.
- Hand a diagram to collaborators with the finished tabs locked, leaving only the working tabs open.
To protect just a few elements rather than a whole board, lock them individually instead. See locking elements.
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