Magic Mirror remote module does not save brightness setting

[leonids]

Just started using MMM-Remote-Control module and found that it does not save brightness setting.
It keeps resetting to the middle point of sliding scale after I exit web page.
Here is what I do:

1. open Magic mirror menu at 192.168.x.x:8080/remote.html
2. click “Edit View”
3. move “brightness slider” all the way to the right
4. click “Save” ,see “Done!” pops up
5. exit web page
6. restart magic mirror
   7 . repeat steps 1-2.
7. Brightness slider is back to the middle position :(

What am I doing wrong?

[sdetweil]

@leonids what raspi os are you using ?
I have never seen any adjustments anywhere to control brightness

Note that the latest os bookworm uses a different display manager

[leonids]

I am using Bullseye with old Rpi2
brightness adjustment is a slider in "edit view "menu
it does change brightness of the font in the display, it just does not save it