Increasing Icon Size in ArcaOS 5.0
ArcaOS 5.0 cames with a functionality called "Dynamic Icon" that allows you to increase the size of icons which was limited on OS/2 Warp.
Increasing the Size of all Icon in the Desktop (Default Size)
To increase all the icon size at the same time of all the icons in the desktop go to "System Setup - Workplace Shell".
On the "Workplace Shell" settings to to the "Icon Size" tab and select