Hi and thanks for reaching out. My name is William. I'm a Microsoft Windows Certified Professional and Systems Administrator. I'll be happy to help you out today.
The system settings panel is part of the so-called UWP app experience. As such, you can try to fix issues with it using PowerShell. Try the following: Right-click the Start > select PowerShell (Admin) > paste this command:
taskkill /F /IM SystemSettings.exe ; taskkill /F /IM explorer.exe ; taskkill /F /IM ShellExperienceHost.exe ; taskkill /F /IM StartMenuExperienceHost.exe ; Start-Sleep 2 ; cd $Env:localappdata\Packages\windows.immersivecontrolpanel_cw5n1h2txyewy ; Remove-Item -Recurse -Force .\* ; Add-AppxPackage -register "C:\Windows\ImmersiveControlPanel\appxmanifest.xml" -DisableDevelopmentMode ; Start-Process explorer
Follow up with this command to address any UWP dependencies that may need repairing:
Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\AppXManifest.xml"}