Can i disable name of Model?

Can i hide this box or disable this function on Javascript ?

Yes you can disable infoBox of viewer like this:

const viewer = new Cesium.Viewer("cesiumContainer", {infoBox:false});

I want to disable only selected Entity but not all of infobox . Can i did?

I’m not sure if there is any inbuilt property to disable infoBox for a certain entity. but you can do that by creating custom infoBox.

You can listen selectedEntityChanged event to trigger custom infoBox like:

viewer.selectedEntityChanged.addEventListener(function(selectedEntity) {
   if(selectedEntity == "your desired entitiy here")
     // create or show div element here
     // remove or hide div element here

Thanks a lot. I will try it.