View Types That Do Not Display in SharePoint Designer
Those views created of type HTML are editable in SharePoint Designer and include the option of modifying or customizing the view XSLT. While the Gantt, Grid, and Calendar views may be opened in SharePoint Designer, they are opened as legacy LVWPs with limited editing capabilities.
You cannot edit an Access view in SharePoint Designer. Also, when you open a Gantt view, instead of displaying existing data, it instead displays a message in design view that says “This control does not have design-time rendering and cannot be modified using this editor” (see Figure 22.45).