This is direct from the Manual
I would also check to make sure the clutch cable is not frayed , as that will/can affect the way the clutch grabs , and it could be holding it slightly engaged , also you might want to check the clutch hub itself , if its getting grooved it will drag/catch and make it harder to shift , also if you fell on the shifter and it got bent , this will make it harder to find neutral , it is possible to have a shift fork slightly bent , and its making it harder to shift , but when under forward movement , its easier because the load is changed because the gears are moving
Also , if your transmission oil level is slightly low , or if the oil viscosity is too thick it can also make the clutch drag , especially when the engine has not warmed up yet , making it hard to find neutral
But usually its in the adjustment , so the above procedure "should" fix the issue , if not then report back
Also , rocking the bike slightly back and forth sometimes helps , as it can relieve the load on the fork , but the need to do this is usually because of the adjustment being on the too much free play side , i run my clutch so the clutch disengages right as the lever touches my remaining fingers on the grip , it gives a good engagement feel while riding , but it tends to make the clutch slightly drag and makes it harder to find neutral , but all of these are things that need to be checked and eliminated