Until now they had been focused on reaching the moon, landing, taking a walk on its surface, setting up experiments, exploring, and gathering evidence. With those tasks completed and their lunar bounty was board, the top priority was to fly back to Earth.
Rear of the LM ascent stage with Earth beyond
Buzz after his moonwalk
Rocketdyne’s artist concept of the Apollo 11 LM ascent stage launched from the surface of the moon