PLEASE!!! STOP.
You DO NOT try to rectify this by tightening that bolt. If you do that more, YOU WILL end up tearing out the threads in the aluminum block with that steel bolt.
The reliance on crush washers is what causes this and it is foolish.
I never install a crush washer that I have not first put a layer of Hylomar Blue on both sides, and allowed it to air cure for a few minutes to tack up a bit. (I’ve written extensively about this product and you can do a SEARCH for Hylomar Blue.)
If you do this before installing the outer crush washer, it will never leak a drop of oil.
Next, your oil is way over-filled!
In sight glass windowed motorcycles, the correct and proper oil level location is HALFWAY between those lower and upper marks beside the window.
The marks represent the MINIMUM and MAXIMUM points and if you look carefully at them, the MAXIMUM level is actually significantly lower than the top of the glass window, meaning there should be no oil visible above that line. Just air space! The MINIMUM mark is actually above the bottom of the sight glass so if you see no oil in the window, you are BELOW the critical minimum level!
As a matter of good technique, making sure that the oil level is HALFWAY between those marks is your very best bet for trouble free operation.
The critical concept here is that in truth, oil level ANYWHERE between those MAXIMUM AND MINIMUM marks is ABSOLUTELY FINE and you do not “chase” the MAXIMUM mark ever!
That way, you do not end up with excess oil being blown out the crankcase vent and into the airbox.
Good luck!