With the model explorer, you have the ability to set focus on an instance. When returning from that focus, the navigation tree resets to the root with all of the hierarchy collapsed. This causes wasted effort. Improve the UI to retain the previous focus and expand down to that previously focused item during the reset. More likely than not, the user will want to return to that area to possible focus on the next instance.

It also allows graceful recovery if a user mistakenly click the focus button, which I have done often. Quality of life change. Lower priority.