Dell P2421DC User manual

Model : P2421DC
Regulatory model : P2421DCc
Dell 24 USB-C Monitor - P2421DC
Dell Display Manager
User’s Guide

NOTE: A NOTE indicates important information that helps you make
better use of your computer.
CAUTION: A CAUTION indicates potential damage to hardware or loss of
data if instructions are not followed.
WARNING: A WARNING indicates a potential for property damage,
personal injury, or death.
Copyright © 2020 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks
are trademarks of Dell Inc. or its subsidiaries. Other trademarks may be trademarks of their respective
owners.
2020 – 02
Rev. A00

Contents | 3
Contents
Overview ....................................................... 4
Using The Quick Settings Dialog...................... 5
Setting Basic Display Functions....................... 7
Assigning Preset Modes To Applications .......... 9
Organizing Windows With Easy Arrange ..........10
Managing Multiple Video Inputs...................... 13
Restoring Application Positions...................... 14
Attach DDM To Active Window (Only Window 10)
.................................................................... 17
Applying Energy Conservation Features .......... 18
Troubleshooting............................................ 19

4| Overview
Overview
Dell Display Manager is a Windows application used to manage a monitor or a group
of monitors. It enables manual adjustment of the displayed image, assignment of
automatic settings, energy management, image rotation and other features on
selected Dell models. After installation, Dell Display Manager will run each time
the system starts and will place its icon in the notification tray. Information about
monitors connected to the system is always available when hovering over the
notification tray icon.
Dell P2421DC - Standard
2019/05/03
3:56 PM
NOTE: Dell Display Manager uses DDC/CI channel to communicate with
your monitor. Ensure that DDC/CI is enabled in the menu as below.
Menu
DDC/CI
Display
Others
Personalize
Dell 24 Monitor
Brightness / Contrast
Color
On
Input Source
Display Info
Reset Others
Factory Reset
LCD Conditioning
Service Tag
Firmware

Using The Quick Settings Dialog | 5
Using The Quick Settings Dialog
Clicking Dell Display Manager’s notification tray icon opens the Quick Settings
dialog box. When more than one supported Dell model is connected to the system,
a specific target monitor can be selected using the menu provided. The Quick
Settings dialog box enables convenient adjustment of the monitor’s brightness
and contrast levels. You can select Manual Mode or Auto Mode, and the screen
resolution can be changed.
Dell P2421DC
The Quick Settings dialog box also provides access to Dell Display Manager’s
advanced user interface which is used to adjust Basic functions, configure Auto
Mode and access other features.

6| Using The Quick Settings Dialog
NOTE:
Feature Function Description
Quick DDM Access Quick key to call up
DDM UI.
Ctrl+Shift+D
Use page up/down key or click on “>”
to flip through all Easy Arrange layouts.
Control individual
monitor in multi-
monitor setup
From dropdown box to select monitor,
selected monitor has Dell logo shown.
Move DDM UI to the monitor to be
controlled.
Press Ctrl+Shift+D to bring up the mini
UI under the mouse pointer.

Setting Basic Display Functions | 7
Setting Basic Display Functions
You can select Manual Mode that enables you to manually select a preset mode
or select Auto Mode that applies a preset mode based on the active application.
An on-screen message displays the current preset mode whenever it changes. The
selected monitor’s Brightness and Contrast can also be directly adjusted from the
Basic tab.
Dell P2421DC
NOTE: When multiple Dell monitors are connected, select “Enable
display matrix control” to apply brightness, contrast and color presets
controls to all monitors.

8| Setting Basic Display Functions
Dell P2421DC

Assigning Preset Modes To Applications | 9
Assigning Preset Modes To Applications
The Auto Mode tab enables you to associate a specific Preset Mode with a specific
application, and apply it automatically. When Auto Mode is enabled, Dell Display
Manager will automatically switch to the corresponding Preset Mode whenever
the associated application is activated. The Preset Mode assigned to a particular
application may be the same on each connected monitor, or it can vary from one
monitor to the next.
Dell Display Manager is pre-configured for many popular applications. To add a new
application to the assignment list, simply drag the application from the desktop,
Windows Start Menu or elsewhere, and drop it onto the current list.
NOTE: Preset Mode assignments for batch les, scripts, loaders,
and non-executable les such as zip archives or packed les, are not
supported.
You can also configure the Game preset mode to be used whenever a Direct3D
application runs in full-screen mode. To prevent an application from using mode,
assign a different preset mode to it.
Dell P2421DC

10 | Organizing Windows With Easy Arrange
Organizing Windows With Easy Arrange
On supported Dell monitors, the Easy Arrange tab enables you to easily arrange the
open windows in one of the predefined layouts by dragging them in the zones. Press
“>” or use Page Up/Page Down key to find more layouts. To create a custom layout,
arrange the open windows and then click Save.
To get started with Easy Arrange, choose a target monitor and select one of
the predefined layouts. The regions for that layout are displayed momentarily on
the monitor. Next, drag an open window across the monitor. While the window is
being dragged, the current window layout is displayed and an active region gets
highlighted as the window passes over it. At any time, drop the window into the
active region to place the window in that region.
Dell P2421DC
To create a custom window layout, size and position the windows (maximum 10) on
the desktop and then click the Save link in Easy Arrange. The size and position of
the windows is saved as a custom layout and the custom layout icon is created.
NOTE: This option does not save or remember the applications that are
open. Only the size and position of the windows is saved.