Did you change the filter? If not 2 qts over filled the motor,and the level may be above the sight class ,and being new it may appear clear and your looking through it if you haven't started the bike. If you did change the filter ,the same thing may have happened ,if you haven't started the bike because the level won't drop until the motor has started and filled the oil filter and passages. place the bike back on the sidestand and see if the level doesn't drop back in to the very top of the glass, or open the filler cap and poke a piece of wire down inside the motor like a dip stick to make sure of the oil level before starting.You can't really know the oil level until after you've run the motor.

Open the oil filler and be sure you don't smell gas.  If your carb float stuck the crank case could have filled with gas and made it hard to see in the sight glass.

I am betting that you are looking right through the clean oil in sight glass.  The sight glass and the motorcycle have plenty of oil in them.  Drain some oil and see if it does not appear in the sight glass.  I have done it multiple times.

If it's not on the ground, then it's in the engine. Make sure you have two empty bottles. 😀

Vercy's right ,if you drain the bike completely it would require 2400 cc /2.5Qts.

Here's You sign !