Use APKPure App
Get Open Settings (shortcut to set old version APK for Android
Opens Settings, for all devices where the vendor has removed the Settings icon
This apps only purpose is to open the built in Android's Settings.
It has been created as some Vendors have hidden or removed the link to open Android's settings.
If you have the 'Settings' app listed in your app drawer then this app has no purpose for you.
In some cases this app may not work for you at all.