If you want to connect a device to Windows-10 please open Devices and Printers in Windows 10 Control Panel
or start the Windows 10 Run Command [Windows-Logo]+[R] and enter the command: control /name Microsoft.DevicesAndPrinters
Please press on the Bluetooth the Blue connect button (hold down 2-5 sec) in this example a Bluetooth mouse.
(... see Image-1)
To learn how to make a device discoverable on Windows 10, check the information that came with your device or go to the manufacturer’s website. Methods for making a device discoverable can vary widely from one type of device to the next. Some Bluetooth enabled devices are always in discovery mode. Others, such as most mobile phones, need to be placed in discovery mode by selecting discovery from a software menu or pressing a button on the device. Discovery buttons can be very small and hard to spot, often placed on the bottom of a mouse, keyboard, or similar device. The button may be labeled with the word connect, or another similar term; a Bluetooth logo or it may not be labeled at all.
(Image-2) Connect a Bluetooth device to Windows 10 computer!