Do you actually use any third-party launcher?

 

is the brightness turned down?

 

Try resetting the desktop theme to default or change it to see.

My upgrade to Pie was smooth, the only issue I could see is that built-in compass app that stopped working. But it has been fixed after I applied a patch (also OTA).

 

The lockdown mode comes with stock Pie, but many manufacturers have removed it, the same way they removed the adoptable storage feature. I have two phones running Pie but none has the Lockdown option.

 

Try another launcher to see, for example Nova. You have nothing to worry because you can change the launcher as often as you wish.

 

Make sure you select the line that says "Wipe cache partition", not the line that says "Wipe data / factory reset".

 

I have a Pixel which also doesn't have it.
Are we sure this is "stock" rather than something one manufacturer has added!?

 

The news about Lock Down mode appeared before Pie was made official, so I believe it's a Pie-specific feature, not something manufacturers can add to a stock ROM.

Still not sure why your Pixel doesn't have it, maybe for the next security patch?

 

I've had about 10 updates since the official release of android 9, so if it pre-dates the official release Google seem to be in no hurry to actually include it.

I'll let you know if it gets added next week

 

OK, I said I'd check after the next update, and I still didn't have it.

So I did what I should have in the first place: searched the settings . Turns out that the option exists but has to be enabled (in "Lock Screen Settings", which isn't entirely obvious).

(I'm not going to enable it though: don't think I really have a need for it. It's even possible I made the same decision a year ago and then forgot that the feature even existed).

 

Glad to know you found it.

But for other brands this thing simply doesn't exist. I don't have it on my phone running the latest Pie upgrade and security patches. That's all I have under the "Lock screen setting" tab.