Currently, the kendoEditorCreateLinkButton does not provide a way to specify the Dialog container, as the following article demonstrates:

https://www.telerik.com/kendo-angular-ui/components/dialogs/dialog/service/#toc-specifying-the-dialog-container

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