Swipe the homescreen from the top once or twice downward:
- tap on or on "Bluetooth".
or
For connecting a new Bluetooth device:
Open "Settings" app :
- tap on "Connected devices",
- tap on "Connection preferences", if needed,
- tap on  Bluetooth,
- enable Bluetooth if that is not the case to check and connect Bluetooth devices. Tap on "Pair new device", if needed.

NB: If a Bluetooth device has already been connected, it's not necessary to launch a search: the smartphone will connect automatically to previous connected devices as soon as Bluetooth connection is enabled on the smartphone.