Bluetooth dongles are usually plug n' play. Have you looked in Device Manager to see if the Bluetooth device has an exclamation point on it?
Since there is no toggle at the top to toggle Bluetooth On/Off in the screenshot you posted something's not running, and it could be either the Bluetooth device driver itself or the service. If there's no exclamation point on the device in device manager do the following:
Type services.msc in the run box then hit enter.
In the services dialog, check the state of the three services that start with "Bluetooth" in their names. Make certain that the Bluetooth Support Service is shown as running. If it shows stopped, then select it, right click, and select 'Start' from the context menu.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.
~ Mark Twain