Hi, and welcome!
Please see the FAQ: What's a reproducible example (`reprex`) and how do I do one? Using a reprex, complete with representative data will attract quicker and more answers.
Bingo! You've described the reason that you aren't seeing anything, so a reprex and data aren't needed.
A <- head(mtcars,1)
# NOTHING TO SEE
A
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 21 6 160 110 3.9 2.62 16.46 0 1 4 4
# VISIBILITY
# ANOTHER WAY
(A <- head(mtcars,1))
#> mpg cyl disp hp drat wt qsec vs am gear carb
#> Mazda RX4 21 6 160 110 3.9 2.62 16.46 0 1 4 4
Created on 2020-04-04 by the reprex package (v0.3.0)