📥 skin - for up to 150% system DPI
📥 script - Autohotkey v1.1 (KMP 4.2.2.51 - 2021 + Win7 + English QWERTY keyboard layout + CZ QWERTZ)
📥 script - Autohotkey v1.1 (KMP64X 2021.04.27.54 + Win7 + English QWERTY keyboard layout + CZ QWERTZ)
Default KMP problems with loss of focus when you must use ALT+TAB or mouse are fixed with script. Some of the hotkeys listed below are not supported by KMP at all and you have to painfully click through the context/menu

Multimedia keys (🟧*00) ,🟩 KMP64X doesn't support global hotkeys
Media Play Pause starts/pauses playback, hold to close KMP
Volume Down reduces the volume, hold to open previous file
Volume Up increase the volume, hold to open next file

MButton show taskbar, hold Always On Top (toggle)
ALT+SHIFT reduce the active window to half the screen and align it right or left or maximize it - global hotkey
LButton+MButton dragging the window (no need to hold down the MButton) - global hotkey

Numpad4 subtitle -0,5s ,🟩 KMP64X "Options / Subtitles / delay step"
Numpad5 subtitle +0,5s
Numpad6 open "Adjust Subtitle Sync" ,🟩 KMP64X doesn't support, hold show/hide subtitle
Enter if "Adjust Subtitle Sync" is active then the written numbers are set, hold closes "Adjust Subtitle Sync"

Numpad1 audio -0,05s (🟧*01) ,🟩 KMP64X -0,01s
Numpad2 audio +0,05s
Numpad3 list of audio streams (the default one is marked first), hold list of subtitles (the default one is marked first), unfortunately NumpadDot (32-bit only) illogically works as a down arrow, because as written below, the up/down arrow is pressed 5 times (32-bit only) for volume

B add bookmark, hold open "bookmark editor"
Enter if "bookmark editor" is active then "Enter" opens the selected (arrows) bookmark and closes "bookmark editor"
Del if "bookmark editor" is active then "Del" remove selected (arrows) bookmark, hold closes "bookmark editor"
P playlist (arrows-select, p/esc close, enter-open/close)

Left previous file
Right next file
Down volume -5%
Up volume +5%

Z zoom- (letterbox)
X zoom+ (letterbox)
C zoom/acpect ratio reset ,🟩 KMP64X zoom reset
PgUp acpect ratio cycle, hold zoom/acpect ratio reset
🟩 KMP64X - create new "end" hotkey in "Options / Keys / Next AR preset" (or 🟦*02), hold acpect ratio reset

ESC pause+minimize, hold close file
1234 window size
Enter Maximize/Restore Window
🟩 KMP64X - to keep the same behavior you need to change the default "Enter" hotkey to "Ins" (or 🟦*02)

Just reducing the gamma in the system makes the original skin quite unusable. Combined with the brightness and contrast reduction, it is almost invisible

KMPCfg.ini (enable - preferences / general / store settings to...). Watch out for the sections
The best volume balance (increasing quiet passages and decreasing loud ones)

[\Software\KMPlayer\KMP3.0\OptionArea]
AudioUseAutoGain_2=int:1
AudioAutoGainType=int:2

Automatically switch to fullscreen (autohide) mode when you open a video file

FulledWindow=int:0
PlayScreenSize=int:7

White blue color theme

ColorThemeName=str:White Blue

Enable+create multimedia hotkeys 🟧*00

UseGlobalHotkey=int:1
ConfigKeyForm=int:0
[\Software\KMPlayer\KMP3.0\OptionArea\GlobalHotkeyList]
N36=int:57425
N39=int:57431
N40=int:57413
N23=int:57417

Permanent hiding the annoying "Album Art" that makes the player UI several times bigger

[\Software\KMPlayer\KMP3.0]
AudioHeight=int:1
[\Software\KMPlayer\KMP3.0\OptionArea]
UserDefPosHeight0=int:1
HeightLen=int:1
WindowHeight=int:1

KMPKey.ini
Create hotkeys 🟧*01

[KMPKey]
N516=K
N501=L

KMPlayer64.ini (enable - options / player / store settings in...)
Change+create hotkeys 🟦*02

[Commands2]
CommandMod0=830 1 2d "" 5 4 0 4
CommandMod1=859 1 23 "" 5 0 0 0