The size and boundaries of the viewport can be set manually via '''Menu > View > Viewport Properties'''. In the Viewport Properties Dialog, you can set the viewport size by specifying the coordinates of the "Top-Left-Near" and "Bottom-Right-Far" points. You can also set the coordinates of the viewing camera location.
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=== Using the Viewports ===
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[[Image:fourport_new.png|thumb|500px|EM.Cube's four-port view of project workspace.]]
[[EM.Cube]] provides a number of standard viewports with preset view angles for viewing a structure. When you start [[EM.Cube]], it is in the '''Perspective View Mode'''. This sets an isometric view of the structure on an XY-plane. Six more standard views are available and can also be accessed from either the '''View Menu''' or the '''View Toolbar'''. You can always return to the Perspective Mode by clicking the '''Perspective View''' [[File:view-perspective_tn.png]] button of '''View Toolbar''' or by simply typing the keyboard's '''Home Key'''. The other six standard views are Top, Bottom, Front, Back, Right and Left views.
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You can also split the main window into multiple viewports. This provides simultaneous Perspective, Top, Front and Right views in the Project Workspace. To split the view, click the '''Split Viewport''' [[File:four-port-view_tn.png]] button of '''View Toolbar'''. Each viewportâs settings can be changed individually. The name of the active viewport on which changes apply is always highlighted with a dark blue background; inactive views are indicated by a gray background. In the Four-Port View mode, you can zoom extents for all four view at the same time by right clicking the '''Zoom Extents''' button [[File:zoom-to-extent_tn.png]] of '''View Toolbar''', or by using the keyboard shortcut '''Ctrl+Shift+E'''. You can always return to the single-port view at any time. To do so, click the '''Merge Viewport''' [[File:single-port-view_tn.png]] button of '''View Toolbar''' or use the keyboard shortcut '''End'''.
[[Image:Info_icon.png|40px]] To find additional details about [[EM.Cube]]'s view operations, see the '''[[Glossary of EM.Cube's Basic File, Edit & View Operations]]'''.