I have a MacBook Pro (16-inch, 2019) with macOS Monterey 12.4.

Here are my battery settings: When unplugged:

During the week, I use it (with its lid closed) plugged in via USB-C to my Dell U4320Q display, which charges it.

On the weekend, sometimes I unplug it (and its lid remains closed).

Why does it then drain the battery?

I'd think that after some amount of time being unplugged with its lid closed (maybe after 30 mins) it would automatically switch into a full hibernation and not use any battery power at all.

I ran pmset -g | grep hibernatemode from https://apple.stackexchange.com/a/426449/53510 and the result was hibernatemode 3.

pmset -g 
System-wide power settings:
Currently in use:
 lidwake              1
 lowpowermode         0
 standbydelayhigh     86400
 standbydelaylow      10800
 standby              1
 proximitywake        1
 ttyskeepawake        1
 hibernatemode        3
 powernap             1
 gpuswitch            2
 hibernatefile        /var/vm/sleepimage
 highstandbythreshold 50
 womp                 1
 displaysleep         10
 networkoversleep     0
 sleep                1
 acwake               0
 halfdim              1
 tcpkeepalive         1
 disksleep            10

What settings should I change (and how) so that it will behave how I expected?

P.S. I've also already seen this and these very old questions:

• Do MacBooks have a true "Hibernate" option?
• How to add hibernate mode to MacBook Pro
• Only hibernate when closing the lid, display sleep otherwise?