how can change start day week in tidyquant?

I want to change the start day week in the Example 1A: Getting and Charting Annual Returns from under link and start my week from Saturday.
do you have any idea?

FANG_annual_returns <- FANG %>%
    group_by(symbol) %>%
    tq_transmute(select     = adjusted, 
                 mutate_fun = periodReturn, 
                 period     = "yearly", 
                 type       = "arithmetic")

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