- modify the theme of the layout 
Arguments
- theme
- A - theme()object used to customize various elements of the plot, including- guides,- title,- subtitle,- caption,- margins,- panel.border, and- background. By default, the theme will inherit from the parent- layout.
- ...
- These dots are for future extensions and must be empty. 
Details
- guides,- panel.border, and- backgroundwill always be used even for the nested- alignpatchesobject.
- title,- subtitle,- caption, and- marginswill be added for the top-level- alignpatchesobject only.
Examples
p1 <- ggplot(mtcars) +
    geom_point(aes(mpg, disp))
p2 <- ggplot(mtcars) +
    geom_boxplot(aes(gear, disp, group = gear))
p3 <- ggplot(mtcars) +
    geom_bar(aes(gear)) +
    facet_wrap(~cyl)
align_plots(
    p1 + theme(plot.background = element_blank()),
    p2 + theme(plot.background = element_blank()),
    p3 + theme(plot.background = element_blank())
) +
    layout_annotation(
        theme = theme(plot.background = element_rect(fill = "red"))
    )
 
