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Window Decoration

For KDE. Make missing shadow of the window appear again.

Edit some settings in KDE shipped "System Settings".

Step 1. Window Rule

Go to "Workspace - Window Management - Window Rules"

Then add a new rule and edit the following properties:

  • Window matching

    • Window class: "Exact Match" - vivaldi-stable
  • Appearance & Fixes

    • No titlebar and frame: "Force" - "No"

Step 2. Window-Specific Override

Go to "Appearance - Window Decorations"

Then edit the theme you are using, in "Window-Specific Overrides", edit the following properties:

  • Regular expression to match: vivaldi-stable

  • Border size: "No border"

  • Hide window title bar

Reference

https://www.reddit.com/r/kde/comments/f3j4k5/anyone_else_not_getting_shadows_for_chromium/