On windows 10
If you wanna close it open command prompt with work with admin. Write NET STOP MySQL80
. Its done. If you wanna open again so you must write NET START MySQL80
If you do not want it to be turned on automatically when not in use, it automatically runs when the computer is turned on and consumes some ram.
Open services.msc find Mysql80 , look at properties and turn start type manuel or otomaticly again as you wish.