Home Monitor (smoke sensor) automatically unlocks front door?

My searches have not been helpful, so I’m hoping that somebody can confirm this behavior. I have a Yale Assure YRD226 smart lock on my front door integrated into ST, along with Zooz ZEN55 Smoke and CO Detector Bridge connected to my hardwired/interconnected smoke/co2 alarms. Last week, one of the alarms was set off, and once the alert was triggered in ST, my front door unlocked automatically. I cannot find any routine that is controlling this, so I’m wondering if this is the default behavior with Smoke sensors enabled in Home Monitor? Not complaining, I actually really like this behavior, I’m just curious.

It is an option under the smoke alarm response settings in STHM

I only see the Set response screen under the Security applet, not Smoke. And in Security, nothing is actually configured. In the lock history, it shows the lock state being set Remotely, which I assume is normal for a routine or programmed feature.

do you see a screen similar to this:

on main dashboard or life section, in the Home Monitor tile, click on the arrow in the upper right. on the next screen, tap on the cog in the upper right of the screen, then tap on the Smoke field

edit: accidentally put Leaks instead of Smoke… corrected that

Yep, that’s where I’m checking:

This is my routine set in the smoke alarm device:

This is what HA is logging (ignore the missing H2S log, as it was off at the time so ST didn’t have to take any action):

HA is not logging the front door unlock/lock, whereas SmartThings does:

tap the cog in the first image you posted. next screen tap Smoke and then choose set response - see if anything is there.

Son of a…

User error on my part. I was clicking on the cog and just assuming that the enable/disable slider was it. I didn’t think to actually click on the item for more options. I’m an idiot - thank you all for the guidance! This action is absolutely set in the response for this.

yes, that screen is in need of a redesign. it catches users all the time. they need to add a block stating click here to configure or something