Mini-LED panel destroying my plans. Help !

Inspiron 16" 2-in-1 with mini-LED display.  It's not capable of of turning off the backlighting in the "off" zones, and the lowest brightness setting in the off zones is still way too bright for reasons I'm about to explain.  Is that a hardware limitation or can it be fixed with a bios update? 

At the store the Inspiron 16 2-in-1 was an IPS display so I didn't get a chance to test out Dell's mini-LED.  The Yoga 16" on display (not a 2-in-1, which I must have) was a mini-LED and that panel did what I was expecting thus I assumed the Inspiron would too, thus I ordered it.  But turns out I was wrong.

Playing around at the store, the Yoga in HDR mode is capable of turning the dimmed zones backlight completely off, and you can step the overall brightness of the whole display in HDR mode to completely off. 

Now that I have the Inspiron with mini-LED, no matter what, the backlighting is still on, even in black areas, when in HDR mode.  And for the areas that aren't set to black, even in the lowest brightness setting, it is still pretty bright, and much brighter than its lowest brightness setting when in SCR mode.  

Why it matters so much to me.  With a Mini-LED panel that can turn the backlight off (or nearly off) in the dimmed areas, with a large 16" display you can set the background to pure black and have open just a small area of the display with your application (like Word or Excel), for example equivalent to a 9" wide display.  With the Yoga, the rest of the display has the backlighting completely off, really conserving battery life.  In the Inspiron, although the unused area of the screen might look black, there is still a fairly strong backlight behind it because it's not capable of turning the backlighting off, and the lowest backlighting level is still fairly bright, wasting a lot of juice.  If it could turn it off, the beauty of it would be the 9" wide active area could be pleasantly bright, and still get great battery life since so much of the display is off.

You might say, just use SCR / IPS mode.  But in that case, when you dim the display to save battery, you're also making it much harder to read the display and do your work.  The mini-LED in HDR could be a perfect solution, if it could further reduce the backlight in the dim zones like the Yoga.

So this is spoiling the party of getting great battery life in HDR mode with a large display with nice brightness in the small active region of the panel.  Can it be fixed in my new Inspiron ?  Thanks for any help you can provide.