Hi Duran,
Thanks for contacting Syncfusion support.
Currently we do not provide support to hide/show widgets based on any conditions. All the widgets added in the designer canvas will be shown in the dashboard preview or in the dashboard server.
If you want to hide widgets based on master-listener relationship, please provide us more details on your requirement, we will consider your requirement as a feature request.
Please do let us know if you have any concerns.
Regards,
Venkataprasad S