Do not have the realtor demo anything or you may be legally responsible for making sure it’s still working after they move in. Seriously, showing The features of a home is a form of advertising and you just don’t want to get into that.
The current advice from pretty much everybody including the National realtors association and the FTC is that you either replace everything with dumb devices Before you show the Home or you factory reset everything and just document the hardware. But do not make any promises about what it will or can do.
See the following discussion thread, which has links to the various organizations with advice,
How do you transition a smart house when you sell it?
Maybe someday having a working smart home will significantly increase the value, but right now, it’s just a minefield for the seller.