Form tree height tableTree default maxHeight, does not work in isFold, late change value vue-table-with-tree-grid

Form tree height tableTree default maxHeight, does not work in isFold, post-change values of Table-with-VUE Tree-Grid 

Mounted () { 
  the this. $ Refs.table. Refs $ [ 'body-warpper']. Style [ ' height '] =' 300px by ' 
}