diff --git a/R/slide.R b/R/slide.R
index 052e3457..158fc690 100644
--- a/R/slide.R
+++ b/R/slide.R
@@ -557,7 +557,8 @@ epi_slide_opt <- function(x, col_names, f, ..., before, after, ref_time_values,
   window_size <- before + after + 1L
 
   pos <- eval_select(rlang::enquo(col_names), data = x)
-  result_col_names <- names(pos)
+  # Always rename results to "slide_value_<original column name>".
+  result_col_names <- paste0("slide_value_", names(x[, pos]))
   slide_one_grp <- function(.data_group, .group_key, ...) {
     missing_times <- all_dates[!(all_dates %in% .data_group$time_value)]
 
@@ -605,8 +606,7 @@ epi_slide_opt <- function(x, col_names, f, ..., before, after, ref_time_values,
 
     if (f_from_package == "data.table") {
       roll_output <- f(
-        x = rlang::set_names(.data_group[, pos], result_col_names),
-        n = window_size, align = "right", ...
+        x = .data_group[, pos], n = window_size, align = "right", ...
       )
 
       if (after >= 1) {
@@ -616,6 +616,8 @@ epi_slide_opt <- function(x, col_names, f, ..., before, after, ref_time_values,
         .data_group[, result_col_names] <- purrr::map(roll_output, function(.x) {
           c(.x[(after + 1L):length(.x)], rep(NA, after))
         })
+      } else {
+        .data_group[, result_col_names] <- roll_output
       }
     } else if (f_from_package == "slider") {
       for (i in seq_along(pos)) {
diff --git a/man-roxygen/opt-slide-params.R b/man-roxygen/opt-slide-params.R
index a7d5b04a..6c1ad99d 100644
--- a/man-roxygen/opt-slide-params.R
+++ b/man-roxygen/opt-slide-params.R
@@ -1,5 +1,9 @@
-#' @param col_names A single tidyselection or a tidyselection vector of the
-#'  names of one or more columns for which to calculate the rolling mean.
+#' @param col_names A <[`tidy-select`][dplyr_tidy_select]> of the names of one
+#'  or more columns for which to calculate a rolling computation. One or more
+#'  unquoted expressions separated by commas. Variable names can be used as
+#'  if they were positions in the data frame, so expressions like `x:y` can
+#'  be used to select a range of variables. The tidyselection cannot be used
+#'  to provide output column names.
 #' @param as_list_col Not supported. Included to match `epi_slide` interface.
 #' @param new_col_name Character vector indicating the name(s) of the new
 #'  column(s) that will contain the derivative values. Default
diff --git a/man/epi_slide_mean.Rd b/man/epi_slide_mean.Rd
index ee3e7838..adb294bc 100644
--- a/man/epi_slide_mean.Rd
+++ b/man/epi_slide_mean.Rd
@@ -23,8 +23,12 @@ epi_slide_mean(
 or ungrouped. If ungrouped, all data in \code{x} will be treated as part of a
 single data group.}
 
-\item{col_names}{A single tidyselection or a tidyselection vector of the
-names of one or more columns for which to calculate the rolling mean.}
+\item{col_names}{A <\code{\link[=dplyr_tidy_select]{tidy-select}}> of the names of one
+or more columns for which to calculate a rolling computation. One or more
+unquoted expressions separated by commas. Variable names can be used as
+if they were positions in the data frame, so expressions like \code{x:y} can
+be used to select a range of variables. The tidyselection cannot be used
+to provide output column names.}
 
 \item{...}{Additional arguments to pass to \code{data.table::frollmean}, for
 example, \code{na.rm} and \code{algo}. \code{data.table::frollmean} is automatically
diff --git a/man/epi_slide_opt.Rd b/man/epi_slide_opt.Rd
index 0772b431..dda2adde 100644
--- a/man/epi_slide_opt.Rd
+++ b/man/epi_slide_opt.Rd
@@ -13,9 +13,9 @@ epi_slide_opt(
   after,
   ref_time_values,
   time_step,
-  new_col_name = "slide_value",
+  new_col_name = NULL,
   as_list_col = NULL,
-  names_sep = "_",
+  names_sep = NULL,
   all_rows = FALSE
 )
 }
@@ -24,8 +24,12 @@ epi_slide_opt(
 or ungrouped. If ungrouped, all data in \code{x} will be treated as part of a
 single data group.}
 
-\item{col_names}{A single tidyselection or a tidyselection vector of the
-names of one or more columns for which to calculate the rolling mean.}
+\item{col_names}{A <\code{\link[=dplyr_tidy_select]{tidy-select}}> of the names of one
+or more columns for which to calculate a rolling computation. One or more
+unquoted expressions separated by commas. Variable names can be used as
+if they were positions in the data frame, so expressions like \code{x:y} can
+be used to select a range of variables. The tidyselection cannot be used
+to provide output column names.}
 
 \item{f}{Function; together with \code{...} specifies the computation to slide.
 \code{f} must be one of \code{data.table}'s rolling functions
diff --git a/man/epi_slide_sum.Rd b/man/epi_slide_sum.Rd
index d5961f27..a56c4c72 100644
--- a/man/epi_slide_sum.Rd
+++ b/man/epi_slide_sum.Rd
@@ -23,8 +23,12 @@ epi_slide_sum(
 or ungrouped. If ungrouped, all data in \code{x} will be treated as part of a
 single data group.}
 
-\item{col_names}{A single tidyselection or a tidyselection vector of the
-names of one or more columns for which to calculate the rolling mean.}
+\item{col_names}{A <\code{\link[=dplyr_tidy_select]{tidy-select}}> of the names of one
+or more columns for which to calculate a rolling computation. One or more
+unquoted expressions separated by commas. Variable names can be used as
+if they were positions in the data frame, so expressions like \code{x:y} can
+be used to select a range of variables. The tidyselection cannot be used
+to provide output column names.}
 
 \item{...}{Additional arguments to pass to \code{data.table::frollsum}, for
 example, \code{na.rm} and \code{algo}. \code{data.table::frollsum} is automatically