in the documents list.Applies to MindManager used with Mindjet Catalyst.
If you don't want anyone else to make changes to a document you can
lock it. Other members can still view the document but they cannot edit
it, and they will see that you have the document locked
in the documents list.
You can lock a map either before or after you open it. If you lock a map while other members are editing it, you'll see a warning, and if you proceed with the lock they will no longer be able to make changes to the map.
Members who view locked maps will see the lock information in the Map Status indicator in the upper-left of the Map View.
Files (non-map documents) are automatically locked when they are checked out for editing, and unlocked when they are checked in, but you can also manually lock and unlock them.
Do one of the following:
Select the document in the Documents list, then on the Workspaces tab, in the Document Access group, click Lock.
Right-click the document name in the Documents list then click Lock.
The "Locked by me" 
icon
in the Documents list indicates documents that you have locked. You will
also see this icon in the Map Status indicator if you edit the map.
Unlock the document by following the same steps, but click Unlock.
Workspace Owners
can break locks on documents locked
or checked out 
by other members:
Select the document in the Documents list, then on the Workspaces tab, in the Document Access group, click Break Lock.
Workspace member access levels