Window
These options decide how the DU Meter window sits on your screen, how it looks, and which tabs it has.
On the desktop
Translucency lets the windows beneath DU Meter show through it: 10% is nearly solid, 80% barely visible. The numbers, on the taskbar or floating, are always solid.
Always on top keeps the DU Meter window and its floating numbers above all other windows. The numbers on the taskbar are always in front of it.
Let clicks pass through to the window behind sends your clicks and typing to the application under DU Meter, so you can work in it through the graph. It needs a translucent window that is always on top. While clicks pass through, the DU Meter window's tabs cannot be clicked: choose one under Current tab in the DU Meter pop-up menu, which opens from the DU Meter icon in the system tray. Floating numbers let clicks through too; to drag them back to the taskbar or into the window, turn this option off first.
Colors and text
Color mode is dark or light. Automatic follows the Windows setting for apps. The numbers on the taskbar always follow the taskbar's color mode.
Text size is the size of the text in the DU Meter window, on every tab, and of the floating numbers. The numbers on the taskbar take the taskbar's height.
Graph window tabs
Show Internet and LAN tabs. DU Meter counts Internet traffic only: its totals, reports and alerts leave out the traffic of your local network (LAN). This option adds a second tab that shows the LAN traffic, for reference, for example while copying large files over the LAN. Where DU Meter counts LAN traffic only, the second tab shows Internet traffic. It needs Internet and LAN traffic kept apart, on the Internet and LAN page.
The numbers show the traffic of the tab the graph shows, and keep the last of the two while the Apps tab is shown. While they show LAN speeds, solid triangles take the place of their arrows. Totals and costs in place of the speeds are always those of the traffic DU Meter counts. The Windows 10 taskbar band has its own choice of tab, in its menu.
Apps tab: average over sets how many seconds the speeds on the Apps tab are averaged over. The tab lists the applications using the network and how fast. The menu of its header shows or hides the Total, Sent and Received columns; when the window is too narrow for them all, the rightmost are left out. For totals per application, see Network Connections Viewer.