Hi @lc_2001,
Welcome to the RStudio Community Forum.
My reading of the table1 package documentation suggests that it is not possible to specify the table layout you require:
library(table1)
?table1
vignette(package="table1")
vignette(topic="table1-examples", package="table1")
You can try and get more help by posting the data and code you used to create your table, or calculate your statistics by hand and investigate other ways to put those values into a suitable formatted table using one of these packages: gt, flextable, huxtable, xtable, kableExtra, tables.
HTH