Blueprint edit functionality allows you to edit a single blueprint, or a selection of blueprints.
Editing capabilities are contextual within the application, this means if one blueprint is selected then only one blueprint will be affected by the changes made. If more than one blueprint is selected then the application will present two options, single Edit (default), and Multi-Edit.1
The default is single Edit, this is also true when multiple blueprints are selected. The multi-edit feature turns on only when multiple blueprints are selected and you choose to turn Multi-Edit on. The changes made to one blueprint applies to all of the selected blueprints when using multi-edit.
To view multi-edit, turn the Advanced Edit Mode on, then select some blueprints and click Edit to show the Multi-Edit and single Edit buttons on the top far-right.