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.