How to delete the custom widgets in settings
To delete the custom widget in the designer, click on the Settings icon in the Bold BI Server as shown in the image below:

Click on the Widgets tab as shown in the image below:

You can delete the custom widget by clicking on the delete icon as shown in the image below:
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NOTE: The custom widget will only be deleted within the particular tenant. This feature is available in On-Premises Deployment but not in Syncfusion Managed Cloud Server.