What if Meizu 5S default theme cannot be found?

Flyme6.0 system: Slide upward on both sides of the bottom of the mobile phone screen to bring up card-type multitasking, select the application to be processed, and slide upward to clear the task record. Click "Free Memory" to clear all currently running processes of the mobile phone; Lock the task: If there is a background application that you don't want to close, you can open the task manager, press and hold the application, and then click Lock.