Description of the Issue

After installing Notepad++ v8.1 under an user account (with admin privilege), then switch to another user account (with or without admin privilege), launch Notepad++ and turn dark mode on. The dark theme on edit zone won't be applied.

Steps to Reproduce the Issue

1. Install Notepad++ v8.1 under an user account with admin privilege
2. Switch to another user account (with or without admin privilege), launch Notepad++
3. Turn dark mode on

Expected Behavior

Dark theme is applied to the edit zone.

Actual Behavior

Dark theme is NOT applied to the edit zone.

Debug Information

Notepad++ v8.1 (64-bit)
Build time : Jun 26 2021 - 19:19:18
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line :
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
OS Name : Windows 10 Home (64-bit)
OS Version : 2009
OS Build : 19042.1052
Current ANSI codepage : 1252
Plugins : mimeTools.dll NppConverter.dll NppExport.dll