Using Visio shapes
Stencils are a collection of related shapes, which are the building blocks of all Visio diagrams.
Browse for shapes
In the Shapes pane, select More Shapes.
Point to a category to browse the stencils in that category.
Select the stencil that contains the shapes you want.
Select a blank area of the drawing page to close the menu.
Select the name of a stencil to see it’s shapes.
Search for shapes
In the search box, type in a keyword that describes the shape you want, and select the magnifying glass
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Select Local to see shapes displayed and categorized by their Visio stencil title.
Or select Online to see shapes available on the web.
Add shapes
Tip: To find out how to use a shape, point to it to display instructions.
Source: Microsoft