This is the 5273rd most frequent Turkish word.
kapatarak
"Kapatarak" means "by closing" or "by shutting."
Here, 'kapatarak' indicates the manner in which the action of leaving the room was carried out, acting as an adverbial participle.
Kapıyı kapatarak odadan çıktı.
She/He left the room by closing the door.
Here, 'kapatarak' shows the means or way through which the energy-saving action was performed.
Işığı kapatarak enerji tasarrufu yaptık.
We saved energy by turning off the light.
Here, 'kapatarak' explains the accompanying action to accomplish the goal of desk cleaning.