KDE settings I tend to change

Set UI scale to 125%.

Settings -> Window Management -> KWin Script -> enable “MinimizeAll”
Settings -> Shortcuts -> Shortcuts -> Kwin -> Set shortcut you want for “MinimizeAll” (default here was Meta+Shift+D)

Right click on this -> Show Alternatives -> Minimize all windows:

RIght click on date -> configure digital clock -> change time display to 24h, date format to custom ddd d. I tried to change locales, but I remember that something somewhere crashed long time ago due to locale mishap (system language in one locale, date in another, money in another, etc). So I don’t do that stuff anymore. The software is so fragile :)

Right click on the speaker icon -> Configure Audio Volume -> Don’t play audio feedback on volume change.

Add a key binding to center windows.

Make Caps Lock another Esc. Unbind Right Alt from Compose key, don’t know what it does anyway. Someday I will remap Caps Lock to Ctrl, but now this thing acts weirdly. In Sublime, when I switch tabs with Ctrl+Tab, tab order is messed up. In terminals Ctrl+Shift+W doesn’t work, unless you release Shift first.

Set keyboard layout switching to Ctrl+Alt+K, show pop-up to false, “Switching policy” to “Application”.

Unbind Meta key from application launcher. Add this to ~/.config/kwinrc:

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[ModifierOnlyShortcuts]
Meta=

No, you can’t do this through Shortcuts settings. Source.

Set key repeat delay to 250ms, repeat rate to 40, pointer acceleration to 0.2, tap to click. My kcminputrc:

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[$Version]
update_info=delete_cursor_old_default_size.upd:DeleteCursorOldDefaultSize,kcminputrc_fix_botched_5_21_0.upd:kcminputrc_fix_botched_5_21_0_pre,kcmi>

[Keyboard]
RepeatDelay=250
RepeatRate=40

[Libinput][1267][12363][ELAN469D:00 04F3:304B Touchpad]
NaturalScroll=true
PointerAcceleration=0.200
TapToClick=true

[Mouse]
X11LibInputXAccelProfileFlat=false
XLbInptPointerAcceleration=0.2

[Tmp]
update_info=delete_cursor_old_default_size.upd:DeleteCursorOldDefaultSize

Don’t suspend session automatically when on battery. Disable screen locking and Meta+L.

[SOLVED] Trying to disable startup sounds on Plasma