If a view is not meeting your organization’s needs, or is merely not being used, you can delete it from Microsoft Project Web App.
To delete a view:
On the Quick Launch, in the Settings section, click Server Settings.
On the Server Settings page, in the Look and Feel section, click Manage Views.
Click a cell in the row for the view that you are deleting, and then click Delete View.
Note: Be careful not to click the name of the view, in the Name column. This opens that view for editing, instead of selecting it.
When prompted, click OK to delete the view.