Dolphin KDE

~/.config/dolphinrc
~/.local/share/kxmlgui5/dolphin
~/.local/share/dolphin/view_properties 

Where is the configuration file to store keyboard shortcuts?
~/.config/kdeglobals
~/.config/kglobalshortcutsrc
~/.config/khotkeysrc
~/.config/kwinrc
~/.config/plasma-org.kde.plasma.desktop-appletsrc
~/.local/share/kxmlgui5/katepart/katepart5ui.rc
~/.local/share/kxmlgui5/konsole/konsoleui.rc
~/.local/share/kxmlgui5/konsole/sessionui.rc
~/.local/share/kxmlgui5/kwrite/kwriteui.rc

Dolphin KDE | Sidebar config-file location for backup and export
~/.local/share/user-places.xbel