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 Add “GRUB_RECORDFAIL_TIMEOUT=0” in /etc/default/grub Then update GRUB by running sudo update-grub Credit: https://techz.io/disable-grub-boot-menu

Edit /etc/systemd/system.conf Uncomment and change the value at line DefaultTimeoutStopSec=90s Reboot for the change to take effect (it will not take effect yet after editing the file before reboot).

  sudo nano /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf   wifi.powersave = 2   Other value: 0: use the default value 1: don't touch existing setting 2: disable powersave 3: enable powersave

sudo nano /usr/share/plasma/plasmoids/org.kde.plasma.timer/contents/ui/TimerView.qml change readonly property int digitH: ((height / 2) * digits < width ? height : ((width - (digits - 1)) / digits) * 2); to readonly property int digitH: 14  14 is the font size, change to any size you want.   To add more timing: sudo nano /usr/share/plasma/plasmoids/org.kde.plasma.timer/contents/config/main.xml At line <default>30,60,120,300,450,600,900,1200,1500,1800,2700,3600</default> add any value in seconds  To use dark theme, create folder /usr/share/plasma/desktoptheme/YOUR_THEME/widgets copy file /usr/share/plasma/desktoptheme/oxygen/widgets/timer.svgz