Hello,
While using the References tool window I've found a something that might improve its usability.
When used with the preview pane visible (side by side, so preview gets a large area and the references tree view is smaller) the view and stack buttons are all the way on the right, so to navigate the tree and move around in the references stack requires mousing all the way from one side of the Reference tool window to the other side and back. Please move the view buttons and references stack to the left side of the references tool window.
I've also used the References tool window as suggested in help:
"Tip
When working with a large display, it can be beneficial to relocate the References tool window to the lower-left corner of the editor, docked below the tool window group containing Files, Projects, Defs, and Symbols, and to the left of the tool window group containing the Preview window. In this configuration, you can switch the References tool window to use the single-pane view."
This does make the Reference tree and stack easier to use. However when i mouse from the References tool tree view to the Preview tool window the Preview jumps to whatever was under the cursor or selected in the active editing window.
If the Reference tool window view and stack nav buttons were on the left side of the Reference tool window then setting things up per the help tip would be unnecessary and also avoid the Preview window from jumping around as it does.