kableExtra::pack_rows() - grouping not working for last row in long table and no indentation for wrapped text

Question

I use the kableExtra package to generate a long table in an R markdown documents knitted to PDF.

Sets of rows of the table are grouped together using

Answer 1

I don't have enough reputation to comment so I'll have to leave this as an answer even though it's only a partial answer to the second part of your question. There is a way to remove all indentation in the pack_rows() function by using indent=FALSE:

kable(dt, 
  escape = FALSE, # to be able to include latex commands
  booktabs = T, 
  longtable = TRUE, # allow long table to span multiple pages
  ) %>% 
  kable_styling(full_width = F,
                latex_options = c(
                  "repeat_header"  # repeat header of long table
                )
  ) %>% 
  # column characteristics: set widths
  column_spec(1, width = "2cm") %>%
  # group rows together and give these groups labels
  pack_rows("Mazda Cars", 1, 2, indent=FALSE) %>%
  pack_rows("Datsun Cars", 3, 3, indent=FALSE)

Unfortunately my table is quite long and would be much more readable if I could find a way to indent both parts of my long row name. So I'm still hoping for a better answer to this question. But I hope this helps someone!