To check the invalid the views marked as invalid in Virtual DataPort, I would execute the below command in the VQL shell:
> DESC DATABASE <database name>
The output of this command is the list of elements of the database, in case that any view is marked as invalid it will be shown with "status: INVALID".
For more information, you could refer to the [ Describing Catalog Elements](https://community.denodo.com/docs/html/browse/latest/vdp/vql/describing_catalog_elements/describing_catalog_elements) section of Virtual DataPort VQL Guide.
Hope this helps!