I am displaying titles at the left, by View>Document map. it displays titles ok but i have a section where the title is heading 1 but the subtitles are heading 4. it doesnt show heading 4 subtitles. there is a lot of those and i need to see them on the left so that i can click easily and go where i want quickly. how to do?

i tried to make them title 3 but it still not visible but under a different title , heading 3s there are visible on the lft