Although Windows 11 shows icons in an Overflow menu on the Taskbar, it is possible to stack or unstack icons on the Taskbar using this tutorial. You can do that with the help of the Registry Editor.

Click on the Bluetooth icon in the taskbar. In the ‘Devices’ window that pops up, scroll down and click on the ‘Connect’ button next to your Onn device.

Since Windows XP in 2001, there's been a constant Bluetooth icon in the Taskbar that would show you options such as available devices, as well as a link to the Bluetooth Settings in the Control Panel.