The 3D Structure Viewer is opened automatically when you open a PDB or MMDB file.

For example, open $UGENE/data/samples/PDB/1CF7.PDB. The 3D Structure Viewer adds a view to the upper part of the Sequence View:

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Notice the Links button on the toolbar. When you click the button the menu appears with quick links to online resources with detailed information about the molecule opened:

Note that if you’re online, you can access the Protein Data Bank directly from UGENE and load a required file by its PDB ID (see Fetching Data from Remote Database for details).

Hint

Don’t forget to select the correct database (PDB) while fetching.