https://www.ninjastik.com/support/2018-macbook-pro-boot-from-usb/

Mac Book Pro: Boot into Recovery Mode
To access Recovery Mode, turn off your Macbook, turn it on and hold the Command (⌘) and R keys. Keep holding them through the chime sound until you see the Recovery Screen below…

Mac OS X Utilities menu:
Restore From Time Machine Backup
Reinstall Mac OS X
Get Help Online
Disk Utility