Notepad++ Search Window disappeared

The issue seems happens if I change monitors configuration , e.g. if I worked on laptop with 2 attached monitors, and next time open Notepad++ when having single laptop monitor.

For me it was sufficient to delete %appdata%\Notepad++\config.xml (not the whole folder).

1. Close Notepad++
2. Open %appdata%\Notepad++ folder (e.g. C:\Users\{UserName}\AppData\Notepad++ )
3. Delete (or rename in case if you want a backup) config.xml
4. Start Notepad++