All changes will be performed in /etc/systemd/logind.conf configuration file.

1. Open configuration file in preferred editor:

   sudo nano /etc/systemd/logind.conf
   

2. Uncomment and change HandleLidSwitch* actions according your needs:
   • HandleLidSwitch=poweroff - shutdown when lid is closed.
   • HandleLidSwitch=hibernate - hibernate when lid is closed.
   • HandleLidSwitch=ignore - do nothing.
   • HandleLidSwitch=suspend - suspend when lid is closed.