<el-tree
	ref="treeRef"
	class="filter-tree"
	:data="data"
	:props="defaultProps"
	default-expand-all
	show-checkbox
	:filter-node-method="filterNode"
/>

.filter-tree {
    
    
	overflow: auto;
}
:deep(.el-tree-node > .el-tree-node__children) {
    
    
	overflow: visible;
}