Shifting from Rstudio to ESS took some time with me because of the steep learning curve of a versatile Emacs editor, but is was a worthwhile experience. What I am still missing in ESS is that outline or overview of the R script file based on comments (called sections in Rstudio) by pressing
Ctrl+Shift+R to give
# some comments or title here (see the screenshot).
After having a lot of sections and the file size becomes very large, it becomes increasingly difficult to navigate throughout a giant multi-section file. In Rstudio I press that orange button
# to pop up a small window of all sections or
# comments and by clicking any one of them will put me on that heading in the file.
Similar thing I found in AUCTeX is the
C-c = which will show an outline clickable table to navigate that
How to obtain this handy overview in ESS?