Retain pin selection when changing plan in Split View

As a user, I would like to retain my pin selection in the split view (split plan view) even if I change the plan - e.g. via the dropdown in the top navigation bar.

Currently, the selection is lost when switching plans, which leads to additional effort, especially when creating reports or comparing several plans. I have to remember the pins or select them again.

If the previously selected pins were still active after the plan change, this would significantly speed up work and make operation more consistent and intuitive.