Phylogenetic Tree Viewer
The Phylogenetic Tree Viewer is designed to display a phylogenetic tree built from an alignment or loaded from a file (e.g., a Newick file).
By default, a phylogenetic tree is synchronized with the corresponding alignment.
To disable or enable synchronization, use the Tree and Alignment synchronization button. 
To load a tree from a file, follow the instructions described in the Opening Document section or use the Tree settings tab of the Options Panel. For example, you may open the $UGENE\data\samples\Newick\COI.nwk sample file provided within the UGENE package.
To build a tree from a multiple sequence alignment, see the Building Phylogenetic Tree section.
To learn what you can do with a tree using the UGENE Phylogenetic Tree Viewer, read the documentation below.