@TheCommon0 What kind of "visual clues" would you expect to indicate that the host lived on the property? Are you one of those people who only wants to look at pictures? Of course you have to read the listing description to find out whether a listing is shared (host lives in the house and rents out room or two or a private suite), whether the listing is a separate cottage or whatever on the property where the host lives in another building, or whether it is a completely private apartment or house with an off-site host.
No, hosts are not supposed to enter the guest's private space (even if it's a room in the host's home) without the guest's permission or prior arrangement. Some hosts make it a policy to come in to clean the guest quarters once a week and change out bedding and towels, but this should be stated in the listing and the host should make this arrangement clear through messaging with the guest, and set a time for this that's amenable to host and guest.
Occasionally a frustrated host, who has repeatedly asked a guest to turn off heaters, lights, AC, etc, when they go out and been constantly ignored, will step into the space to do this. Leaving a heater on can be a fire hazard, and leaving the AC or any other utilities on can rack up a a huge bill, far above what the host budgets for when pricing their listing.
And of course, in an emergency situation (a fire, water leak, etc.), the host would enter to deal with the issue.