Hello Petyo,

It looks like the current feature request does not get popular in the past years, that is what we are declining this feature request.

Since the desired behavior currently is not going to be implemented (if it turns to be popular in the future we will reconsider the states of the request), the developer can utilize the hidden property of the <kendo-grid-column> as the following article describe:

https://www.telerik.com/kendo-angular-ui/components/grid/columns/hidden/

Please check the following example which hides the CategoryName column when the Grid is grouped by this column:

https://stackblitz.com/edit/angular-ukjrbt

Keep in mind that the hidden property should be set back to false, once the Grid removes the groups.

Regards,
Martin
Progress Telerik