Centre the title of ggplot

General
1

with the above link suggestions, I have tried both

theme(plot.title = element_text(hjust = 0.5))

and

ggeasy::easy_center_title()

It works perfectly inside RStudio, however when deployed inside Shiny Server, its title always go the left. Any specific reason? Could the reason that I have too many overlapping plots?

  gg <- ggplot(data = DF_3.0) + 
          geom_histogram(aes(x = cal0_grade), breaks = bins_grade, fill = "yellow", alpha = 0.2) + 
          geom_histogram(data = DF_3.1, aes(x = cal1_grade), breaks = bins_grade, fill = "red", alpha = 0.2) +
          geom_histogram(data = DF_3.2, aes(x = cal2_grade), breaks = bins_grade, fill = "blue", alpha = 0.2) +
          geom_histogram(data = DF_3.3, aes(x = cal3_grade), breaks = bins_grade, fill = "green", alpha = 0.2) +
          scale_y_log10(breaks = trans_breaks("log10", function(x) 10^x),
                        labels = trans_format("log10", scales::math_format(10^.x))) +
          ggtitle(title3) + theme(plot.title = element_text(hjust = 0.5)) + 
          xlab("%")+ ylab("count (log)")

But why inside RStudio its title is centred, but in Shiny Server, it is to the left?

2

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