Is there a way to extend the “Open Call Hierarchy” function to the whole working set or workspace? (i.e. across multiple projects) This would be very handy when searching for deprecated methods and dependencies.
By default Open Call Hierarchy searches in workspace. Click on down arrow in Call Hierarchy view to see Search In... and Search Scope options.
Guide to find down arrow:
In the Call Hierarchy view window from the right there are Maximize, Minimize and View Menu. View Menu is represented by a triangle pointing down and that is what you need to click.