The information box in the Tree Explorer lists the various statistical attributes of the displayed tree with the branch or node highlighted. It usually contains multiple tabs.
General: This reminds the user of the number of taxa (and groups, if any) and of the strategy used to deal with gaps and missing data.
Tree: This contains information about the type of tree rooted/unrooted, and the sum of branch lengths, SBL, or the tree-length. In addition, information about the total number of trees and the tree number of the current tree is displayed.
Branch: In the Tree Explorer window you may click on a branch or on a node of the tree. If you click on a branch, this tab displays its location in terms of the two nodes it connects. (Leaf taxa are numbered in the order in which they appear in the input data file.) This window also displays the length of the selected branch. If you click on a node, the internal identification number of that node is displayed.