Contraction of nodes

Hello, everyone. Recently, I encountered some difficulties in using GO.JS on the mobile side, so please help me.
My projects have a large amount of data to use, according to the tree and the tree view in the display of data, when I want to get the data, if there are children under the node, it will automatically contraction child list, free people click on your list. So, what should I do?

I’m sorry, but I do not understand what the problem is. Could you illustrate with before and after screenshots, describing exactly what the user is doing?

Also, does this problem happen in any of the three kinds of desktop browsers?

I use the PanelExpanderButton to control the contractions of the child nodes. At the beginning, the default sub node is extended, and I want to change his default to shrink

Set visible: false on that object that is controlled by the “PanelExpanderButton”.