By default, the macOS Finder re-opens all windows from the last session when logging in. The following LaunchAgent uses AppleScript to close all Finder windows on startup: Put it into ~/Library/LaunchAgents/com.example.CloseFinder.agent.plist and load it using launchctl load ~/Library/LaunchAgents/com.example.CloseFinder.agent.plist On the next startup, there should be no more open Finder windows from the last session.
