Wheel not spinning freely

[Ajax Bay]

The hubs rotate (freely) on bearings. The bearings (balls) rotate between cups (part of the hub) and cones (screwed onto the axle). Grease is good: lots.
Have a read of Sheldon Brown's article to help you.
And Bike Gremlin.
The simple symptom described in the OP (and we might reasonably assume that the wheel has bearings/cones fitted 'properly') is that the cones are a tad tight which means that though they spin OK 'in the hand' when the QR is tightened properly, there's too much compression on the bearings and they bind (as @ColinJ has said).
On exposed axle threads, these should be the same length both sides. No excuses like "if I try to even it out the hub becomes loose" have any merit.

 

[Moodyman]

It seems the wheel spins more free now but listen to the sound.

Tomorrow I will add grease and not sure about the cones.


View: https://twitter.com/Laurisss333/status/1296902358887211010

That wheel is stopping very suddenly, which suggests the bearings are overtightened.

To get the preload correct, tighten the cones until they feel just right in the hand - i.e. spin freely with no side to side play.

Then, back off a quarter turn. The backing off creates miniscule side to side play which, when tightened in the bike frame will disappear.

 

[Gunk]

It is possible to service that hub with the cassette in situ, I use a magnet to carefully remove all the balls and clean them thoroughly in a pot with some WD40 or white spirit and dry them off.

Then clean the inside of the hub thoroughly removing all the old grease, apply some fresh grease and carefully fit each ball one by one using an electrical screwdriver dipped in grease, takes some time and patience but the reward is how smoothly the wheel spins when you’ve finished.

 

[Ajax Bay]

It is possible to service that hub with the cassette in situ

Yes, but why would one? For the extra challenge? How hard is it to undo a lockring and slide the cassette off?

 

[Gunk]

Yes, but why would one? For the extra challenge? How hard is it to undo a lockring and slide the cassette off?

I agree, but some don't have all the tools or with an older freewheel, the bugger won't come off!

 

[Lauris]

It is possible to service that hub with the cassette in situ, I use a magnet to carefully remove all the balls and clean them thoroughly in a pot with some WD40 or white spirit and dry them off.

Then clean the inside of the hub thoroughly removing all the old grease, apply some fresh grease and carefully fit each ball one by one using an electrical screwdriver dipped in grease, takes some time and patience but the reward is how smoothly the wheel spins when you’ve finished.

Yeah, I don't have the tool to remove cassettes but I also do have a magnetic screwdriver. So that helped.