[Inkscape-user] Inkscape - insensitive mode

Hi all

Please forgive a newcomer to Inkscape and someone who knows nothing about the programming behind the screen:

Using the selector tool, I can make objects/groups of objects "insensitive", which is potentially very useful as I can then use it like e.g. Photoshop to make a quasi-layer

BUT

Can I undo this later - i.e. can I come back to the "insensitive" object or group and "re-activate" it?

Regards to all

Adam in Australia