Currently, the kendoEditorCreateLinkButton does not provide a way to specify the Dialog container, as the following article demonstrates:
Please consider providing a built-in appendTo option to the link button directive. This will help to determine where the Dialog will be appended when the Editor is used within a kendoGridEditTemplate/kendoGridCellTemplate:
Using kendoGridEditTemplate:
https://stackblitz.com/edit/angular-yddl1n-inbwen
Using kendoGridCellTemplate:
https://stackblitz.com/edit/angular-yddl1n-t3afde