[Q] Need help Theming recents menu topic

Hi. I am kind of a noob to cooking custom roms. I have customized the stock rom for my device with launchers and apks but I want to change the recents menu (multitasking menu). How am I supposed to do that?
I tried decompiling systemUI.apk and framework-res.apk but found nothing regarding recents menu.

PLEASE HELP.