While planning a new sprint I am able to see how much work is planned for the sprint in the summary row (section) below the sprint backlog. In this section I can see the amount of remaining work (estimate). This is essential for the proper planning of the sprint. We combine this with a Quick filters by Assignee in order to allow proper planning of the individual tasks.

However, once the sprint is is started, if you go to the Plan mode, you are not able to see the estimates summary row (section) below the sprint anymore. This is inconvenient as this it is hard to tell how much work is remaining - if you want to slice the work by some other criteria (besides status - statistic for which is available in the top-right corner of the sprint).
What is needed is one of the following:

1. Keep the estimates summary row (Section) below the sprint - for the started and for the not yet started sprints - the estimates summary should reflect the applied Quick Filters (as for the not started sprints), or
2. Update the sprint estimate statistics (on the top-right) corner according to the selected Quick Filters.