I know that you can do this by going to Search in the Tools menu, or by Shift-Command-F, and then choosing the group from the panel, but it would be great to make this more seamless, for instance, when right-clicking on the group, having “Search within this group” as an option in the contextual menu.
There are many reasons why I always use the full Search window (Tools > Search), instead of the query field in view and document windows.
One of those reasons is that the settings can be inspected at a glance in the Search window. But when using the Toolbar Query, one has to remember to check the current settings, which are not immediately visible.
And, of course, there are a number of options and features available in the full Search window, that are not available in the Toolbar Query.