The main thing is to make it modeless. When there's space, like on a large desktop window, put the selector alongside the preview. Then any change in selection should update the preview without additional clicks. Basically 1 click should change a feature and another click change it to something else.
If you used it for any length of time, these things should be self evident as annoyances to be streamlined. As an exercise, try every selection for every option while looking at the preview for each result.
If you used it for any length of time, these things should be self evident as annoyances to be streamlined. As an exercise, try every selection for every option while looking at the preview for each result.