Android : Smartphone density screen

I am trying to build an application for Android.

I have a problem to understand the screen density.

According to this:

• LDPI: Low density, ~120 dots per inch


• MDPI: Medium density, ~160 dots per inch


• TVDPI: Medium High density, ~213 dots per inch


• HDPI or HiDPI: High density, ~240 dots per inch


• XHDPI: eXtra High density,~320 dots per inch


• XXHDPI: eXtra eXtra High density, ~480 dots per inch


• XXXHDPI: eXtra eXtra eXtra High density, ~640 dots per inch

when I should try to set density at 120 dpi, using the command wm density 120 the stock density at my Note 3 (480 dpi) should be changed with less dots per inch and that means that less items should fit to the screen.

But, when I execute it the items on the screen are shrink and I get a better density!

What am I not understanding well?