Straight answers about the macOS Dock. No sign-up, nothing gated, and every Terminal command you need is on the page.
The divider is a drag handle sitting exactly where your pointer travels, and macOS has no undo. Why it happens, why your windows move too, and three ways to stop it.
One command puts the Dock back to factory settings. What it clears, what it leaves alone, how to back up your layout first, and how to reset only the part you need.
Tick which parts of the Dock to lock and get the exact Terminal commands, including the fourth one most guides leave out, plus the commands to undo them.
macOS says the settings were configured by a profile, even when no profile exists. How to tell which of the two causes it is, and how to reverse each one.
The Dock follows your pointer, so it lands on whichever screen you last reached across. The three built-in workarounds, what each one costs you, and the Terminal fix that stopped working.
Family Mac, front desk, classroom or kiosk. The four locks, why anyone with Terminal can undo them, what Screen Time cannot do, and the profile that actually holds.
Terminal commands, a configuration profile, or an app. All three use the same macOS settings underneath. What each one costs you, and which to pick.
Cmd W closes the front tab with no warning, and it sits right beside Cmd Q. Reassign it, recover the tab, or make it ask first.
Q sits next to W, and one of them closes a tab while the other closes everything. Why Command Q quits without asking, how to reassign it in System Settings, and how to stop losing Safari tabs.
Four working locks for size, position, contents and auto-hide, with the commands to undo each one. Plus the fifth setting everyone repeats that does nothing at all.