This is one problem that annoyed me for some time, the client displaying is always looks like out of scale compared to the actual picture.
Even if i resized the client windows while pressing Ctrl (which suppose to be resize according to scale but actually didnt)
I asked myself why is this happening? So I make a simple calculation, and I find out that NoMachine client scaling is counting the Windows title height, which are not correct, please see below for better self explanation.
In summary, the scalable should consider only display plot only, without title height. I hope I explained the situation correctly.