Can't clear some apps after 6.0 upgrade

[SatterwhiteMedia]

After a recent upgrade to Android 6.0, when I go to the list of open apps, there are now three that cannot be closed: Google Maps, YouTube and Gmail. Is there a way to remove these from the list? The most annoying one is Gmail, because I don't use it, and it's just clutter in my apps list. What up?

LG G3
LG-D850
Android 6.0
Software Version: D85030I

 

[LG1337]

Do you mean recently used apps? Try restarting the phone they should disappear.

 

[SatterwhiteMedia]

Sorry...slow reply. I figured it out. Some apps had the "pin" function activated. All good at this end. Thanks.