I feel u might have trouble locking the...
Go back to the whatsapp chat screen first before minimising the app. It allows the picture in picture function to work properly.
Check under status bar in the display section of the settings. The icon for Bluetooth might've been disabled.
Long press and mute notification
It usually requires 2 quick swipes to open the notification panel.
Try setting up the fingerprint again in a dark room. It helps
Change the graphics settings to the lowest. 90fps should pop in the frame rate section. It will work only with the lowest settings. Hope this solves...
Used Niagara launcher.
For the widget, used kwgt which is a custom widget maker. You'll need the pro version to really use it tho
Halo and viral icon pack