Hello,
In our Vue Native Grid we can achieve this by providing the correct expanded filed attribute to the items after the data is grouped. Here is an example how this could be done - https://stackblitz.com/edit/zey9n8-vjwusn?file=index.html
Regards,
Plamen
Progress Telerik
Having something like expandGroup/colapseGroup that the JQuery Grid has seems basic to me!
The Vue Native grid is very limited and I see no progression (n terms of features and even the documentation for a long time! It seems clear to me that kendo ui is a little stalled in development and lagging behind other alternatives where the money maybe will be better spent.