/usr/share/plasma/shells/org.kde.plasma.mediacenter/contents/defaults is in plasma-mediacenter 5.7.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | [Desktop]
Containment=org.kde.desktopcontainment
ToolBox=org.kde.desktoptoolbox
RuntimePlatform=
[Theme]
name=breeze-dark
[Panel]
Containment=org.kde.panel
ToolBox=org.kde.paneltoolbox
[Panel][ContainmentActions]
RightButton;NoModifier=org.kde.contextmenu
MidButton;NoModifier=org.kde.paste
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