Scale kable table to fit page width

Question

How do you format a table in pdf using kable function? Because my output table width exceeds the width of the pdf. Here is an example:

---
output: pdf_document
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Answer 1

Note if you are using longtable, this answer says,

since longtable doesn't support resizebox, you cannot use the "scale_down" option in latex_options.

However, they suggested using font_size, e.g.,

kable(df, "latex", longtable = T, booktabs = T) %>%
  kable_styling(font_size = 7)