Transparency effects in Windows 11 has some window backgrounds and surfaces appear slightly transparent with an acrylic blur effect.
Some of these windows include context menus, File Explorer, Quick Settings, Settings, sign-in screen, Start menu, taskbar, and more.
See also:

Materials used in Windows 11 apps - Windows apps
The materials Windows 11 uses to create app hierarchy
docs.microsoft.com
This tutorial will show you how to turn on or off transparency effects for your account in Windows 11.
If you turn on high contrast, it will disable transparency effects.
Contents
- Option One: Turn On or Off Transparency Effects in Personalization Settings
- Option Two: Turn On or Off Transparency Effects in Accessibility Settings
- Option Three: Turn On or Off Transparency Effects using REG file
EXAMPLE: Some windows with transparency effects turned on and off
1 Open Settings (Win+I).
2 Click/tap on Personalization on the left side, and click/tap on Colors on the right side. (see screenshot below)
3 Turn On (default) or Off Transparency effects for what you want on the right side. (see screenshot below)
4 You can now close Settings if you like.
1 Open Settings (Win+I).
2 Click/tap on Accessibility on the left side, and click/tap on Visual effects on the right side. (see screenshot below)
3 Turn On (default) or Off Transparency effects for what you want on the right side. (see screenshot below)
4 You can now close Settings if you like.
1 Do step 2 (on) or step 3 (off) below for what you would like to do.
2 To Turn On Transparency Effects
This is the default setting.
A) Click/tap on the Download button below to download the file below, and go to step 4 below.
Turn_on_transparency_effects_for_current_user.reg
(Contents of REG file for reference)
Code:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize]
"EnableTransparency"=dword:00000001
3 To Turn Off Transparency Effects
A) Click/tap on the Download button below to download the file below, and go to step 4 below.
Turn_off_transparency_effects_for_current_user.reg
(Contents of REG file for reference)
Code:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize]
"EnableTransparency"=dword:00000000
4 Save the .reg file to your desktop.
5 Double click/tap on the downloaded .reg file to merge it.
6 When prompted, click/tap on Run, Yes (UAC), Yes, and OK to approve the merge.
7 You can now delete the downloaded .reg file if you like.
That's it,
Shawn Brink
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