Changing screen scale in LXDE

There is an option to set global scale in LXDE.

Edit (or create) .Xresources in your home folder and set the dpi

Xft.dpi: 150

For my Dell XPS I have set it to 200 and works reasonably well

1280x1024 and you need to scale down? My desktop screen is that resolution and I still use Dejavu Sans size 11/12! But I have bad sight.

There's no global "scaling" in LXDE; you change font size (in lxappearance), or icon size in the panel's size parameters (right click the panel and choose the panel parameter entry).