The Fred Meyer (Kroger) in my neighborhood has 4-5 armed and body armored security guards stationed at the entrance and exits. They ask to check your receipts at the exit and search all your bags.

Its actually illegal to force someone to stop since its not a private club like Costco, so you can just tell them no and keep walking. Thats not well known though so you have stormtroopers checking old ladies papers and searching all their belongings.

Oregon allows off duty officers to moonlight as armed guards so a lot of them are cops from various departments. During the 2020 protests there were a few Federal Protective Service agents patrolling the store.