To lock an individual object/group:
Select the object or group, and, in the Object Inspector, set the Selectable property to False. You can set it to False either by selecting False in its list or by double-clicking its value to toggle between True and False.
To unlock an individual object/group:
Select the object or group, and, in the Object Inspector, set the Selectable property to True. You can set it to True either by selecting True in its list or by double-clicking its value to toggle between True and False.
To lock one or more objects/groups in a single operation:
If necessary, in the Structure area, select the page containing the object(s) and/or group(s) whose Selectable property you want to clear.
Do either of the following:
To lock only a selected set of objects/groups: Verify that all the objects you want to lock are selected, then choose Page Layout | Lock/Unlock | Lock Selected Objects.
To lock all objects/groups: Choose Page Layout | Lock/Unlock | Lock All Objects on Page.
To unlock one or more objects/groups in a single operation:
If necessary, in the Structure area, select the page containing the object(s) and/or group(s) you want to unlock.
Do either of the following:
To unlock only a selected set of objects/groups: In the Structure area, select each object you want to unlock, then choose Page Layout | Lock/Unlock | Unlock Selected Objects.
To unlock all objects/groups: Choose Page Layout | Lock/Unlock | Unlock All Objects on Page.