Layers can not be deleted or edited, so if you would like to change streaming distance Settings, create a new layer with your desired Settings and assign levels to it.
特别注意！层不能被删除或编辑的，所以如果你想改变关卡流的距离设置，用你需要的设计来创建一个新的层，并且给它分配对应的关卡。
By default, the group "all" will exist on the top. This group contains all the contacts, and cannot be deleted or edited.
预设“全部”位于最上方，这个群组显示所有的联系人，且不能被删除或编辑。
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