'R GGally::ggpairs correlation matrix: How to insert scales between cells and how to specifically change the size of each row/column

I draw a correlation plot from iris data for explanation.

p <- iris %>% 
  dplyr::select(Sepal.Length, Petal.Length, Species) %>% 
  ggpairs(mapping = aes(color = Species),
          lower = list(continuous = "smooth"),
          diag = list(continuous = wrap("densityDiag", alpha = 0.5))
          ) + 
  theme_classic()
p

I have two questions.

  1. See the following figure. The y-axis surrounded by the red rectangle is the axis for the density plot. That scale does not work for the right bar plot. Then, I want the axis for the bar plot around either of blue rectangles. Is it possible?

click for my image

  1. Is it possible that the size of each row/column is changed specifically? The following image shows an example of change of the width of the 3rd column.

click for my image

Thank you very much.

ggallyggpairs


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