Reset contrasts?

To run Anova with type III errors, I was told to reset my contrasts as shown below and it worked. But how do I reset it back to the R default?

options(contrasts = c("contr.sum", "contr.poly"))

It should reset automatically if you restart your R session (ctrl+shift+F10 in RStudio). But on a fresh session, this is what it looks like:

#> $contrasts
#>         unordered           ordered 
#> "contr.treatment"      "contr.poly"

Created on 2022-08-22 by the reprex package (v2.0.1)

(note that reprex is creating a fresh session, so it's always a good way to see the default options).

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