Every fresh Mac starts the same way: beautiful, and slightly wrong. Tahoe's Liquid Glass look is the biggest visual change in years, and the defaults are tuned for the demo, not for a full working day. These are the five settings I change first on a new install. Ten minutes, and the machine stops showing off and starts working.
1. Tone down Liquid Glass
System Settings → Accessibility → Display → Reduce Transparency. Tahoe's glass is everywhere: menus, sidebars, the menu bar itself. It looks great in a keynote and gets tiring by lunch, especially over a busy wallpaper. Reduce Transparency replaces the see-through panels with solid ones, and the whole interface instantly gets easier to read.
If that feels too drastic, try the gentler option first: System Settings → Appearance → Liquid Glass → Tinted (Tahoe 26.1 and later). It keeps the glass but makes it denser, so text stands out better. Note the two don't combine — turning on Reduce Transparency disables the Tinted option. Pick one and live with it for a day before deciding.
2. Audit your notifications
System Settings → Notifications. A fresh Mac lets every app shout at you. Go down the list and turn off "Allow notifications" for anything you don't need to hear from in real time — app store promos, social apps, anything that treats your attention as free. While you're here, set Show previews → When Unlocked, so message contents don't sit on your lock screen for anyone walking past to read. Noise down, privacy up, one pane.
3. Ask for your password immediately
System Settings → Lock Screen → Require password after screen saver begins or display is turned off → Immediately. The default grace period means someone can wake your Mac and walk straight in for a while after you step away. "Immediately" closes that gap: the moment the screen sleeps, it's locked. It costs you one password prompt per wake, and it's the cheapest security improvement on this list.
4. Turn on FileVault
System Settings → Privacy & Security → FileVault → Turn On. FileVault encrypts the whole drive, so if the Mac is ever lost or stolen, what's on it stays unreadable without your login. On a modern Mac the performance cost is negligible — you won't feel it. Let it encrypt in the background (it takes a while on a big drive; just keep using the machine), and keep the recovery key somewhere safe that isn't the Mac itself.
5. Make it yours in Appearance
System Settings → Appearance. This is the fun one, and it's where Tahoe actually gives you something new. Pick Light, Dark, or Auto (which follows the time of day), set an accent colour, and then try Icon & Widget Style: Tahoe lets you restyle every icon — Dark, Clear, or Tinted in your accent colour — and even recolour individual folders. A dark set of icons with an orange tint, say, makes the whole machine feel like it belongs to you rather than to the showroom. Five minutes of fiddling here pays off every time you look at the desktop.
That's the day-one list. Everything else — trackpad gestures, Hot Corners, Finder preferences — can wait until you notice you want it. Get the glass calm, the noise down, and the encryption on, and Tahoe feels like yours.