See how to remove assets from your Vizible Asset Library.
Some consideration should be taken when deleting assets. Other scenes that rely on the asset would break if the asset were truly deleted from the servers. Because of this, it will no longer be available for future use.
Delete a Single Asset
Right click the asset you wish to delete
Select Delete Asset in the context menu that pops up
The asset will be removed
Delete Multiple Assets
Use the Ctrl + Left Mouse Button combination to select multiple assets individually
Also you can use Shift + Left Mouse Button to select a range of assets
Right click one of the selected assets
Select Delete Asset in the context menu that pops up