Generally the IDE will detect one it can use, so you shouldn't need to use the Device Manager.
When you select the board type, so far, so good.
Then when you ask it to pick the port, it will present a list of ports that it has discovered that are registered in the Device Manager.
One thing you will notice is that if you have a Genuine Uno, for instance, it will list that next to the port name.
But if you are using a board (of any type) that have the CH340-type port it will show just the COM9 or whatever it finds.
So by trying each one you will find a port that works with your board.
I am sure you have already seen the errors it throws when you use a port that won't work for you.
If you have tried all the ports listed, then you are left with only a couple of possibilities: Either the cable is bad, or the board is not responding.
Ultimately, it doesn't matter what it says in Device Manager if the IDE won't use it.
Good luck.