The cols_width() function

Use exibble to create a gt table. We can specify the widths of columns with cols_width(). This is done with named arguments in ..., specifying the exact widths for table columns (using everything() at the end will capture all remaining columns).

exibble |>
  dplyr::select(
    num, char, date,
    datetime, row
  ) |>
  gt() |>
  cols_width(
    num ~ px(150),
    ends_with("r") ~ px(100),
    starts_with("date") ~ px(200),
    everything() ~ px(60)
  )

num	char	date	datetime	row
1.111e-01	apricot	2015-01-15	2018-01-01 02:22	row_1
2.222e+00	banana	2015-02-15	2018-02-02 14:33	row_2
3.333e+01	coconut	2015-03-15	2018-03-03 03:44	row_3
4.444e+02	durian	2015-04-15	2018-04-04 15:55	row_4
5.550e+03	NA	2015-05-15	2018-05-05 04:00	row_5
NA	fig	2015-06-15	2018-06-06 16:11	row_6
7.770e+05	grapefruit	NA	2018-07-07 05:22	row_7
8.880e+06	honeydew	2015-08-15	NA	row_8