Is anyone familiar with using Bootstrap Consensus Tree in MEGA software?

I am using MEGA5 or MEGA6 to build a phylogenetic tree.
In the tree viewer, after the tree has been built, I can select either Original Tree tab or Bootstrap Consensus tab. I would like to have the bootstrap consensus tree, so I go on selecting it.

However, I realize that in this case the lengths of the branch lines are unrelated to branch lengths, although I didn't select the "Topology Only" option.

It seems that this option is automatically applied (and not changeable) when the consensus tree tab is selected.

Is this the correct behavior or is there something wrong in what I am doing/seeing?

Thank you!