can't change battery or adapter settings

 Are there any AntiVirus, Disk Cleaner, Optimizers, Defrag, VPNs etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation. The Built-in Security of Big Sur is all that is required.

With " uninstalling F-Secure did the trick " not too much more to ut things right. The computer is functioning as it should ? Then leave well enough alone.

Only added thing is to consider is a Rescue Plan. This comprises having 3 Backups using 2 methods and 1 Off Site incase of Theft, Loss or Natural Disasters. A Time Machine Backup  is very useful and can be used to Revert to Previous Working macOS. For addition purposes - two Tested Bootable Clones each to separate external drives. This is insurance incase the upgrades goes sideways. At least one Tested Clone and / or Time Machine Backup should be Off - Site

Start up a Mac with Apple silicon M1 in safe mode

1. On your Mac, choose Apple menu  > Shut Down.
2. After your Mac shuts down, wait 10 seconds.
3. Press and hold the power button on your Mac until the startup options window appears showing available startup disks and Options.
4. Select a startup disk.
5. Press and hold the Shift key, click Continue in Safe Mode, then release the Shift key.

Try restarting in Safe Mode and see if the problem persists.

Regarding the screenshots: if you use command-shift-3 the image may be too large to post. Press command-shift-4 and drag to select the relevant area of your screen.

Something that is running in your account when you boot normally is causing a problem.

Please run Etrecheck and post its full report here.

Use the “additional text” button and paste the report into the text box.

Suggest downloading the Application Etrecheck directly from a Trusted Developer and well Respected ASC Contributor. The application is free or paid from added features. Run the application with Full Disc Access ( Security & Privacy - Full Disc Access ). It will take a Snap Shot -  both the hardware and software. The Report will Not Reveal Any Personal Information. Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )

We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.

The Report indicates the System is a real mess and heavily altered plus running Antivirus Software F-Secure and No Rescue Plan.

If I were you, and I am not, would wipe the entire drive and reinstall a Clean Copy of Big Sur and be very very selective as to what was installed.

As P. Philips said, get rid of F-secure. This is likely causing the problem and it should not be there anyway.

https://discussions.apple.com/docs/DOC-8841