Quarto ggplot2 font sizes increase with chunk option fig.width and layout-ncol - ggplot2

Question

I use an #| layout-ncol option in quarto to place figures side-by-side. However, in combination with the chunk option fig.width the font size is changing as well. It seems as if the plot is zoomed in. I am searching for quite some time for a solution but was not able to figure out how to maintain all font sizes at a fixed size. I produced a little example illustrating the problem:
Only difference between first and second chunk is basically the addition of fig.width=3 in the second chunk.
---
format:
html:
theme: default
---
```{r echo=FALSE, message=FALSE, warning=FALSE, fig.asp=1}
#| layout-ncol: 2
library(ggplot2)
data <- data.frame(
x = c(1:10),
y = c(11:20)
)
ggplot(data=data, aes(x=x, y=y)) +
geom_smooth(method = 'lm') + geom_point() + theme_classic() +
theme(axis.title = element_text(
size = 10)) +
ylab("Y-Axis") +
xlab("X-Axis")
ggplot(data=data, aes(x=x, y=y)) +
geom_smooth(method = 'lm') + geom_point() + theme_classic() +
theme(axis.title = element_text(
size = 10)) +
ylab("Y-Axis") +
xlab("X-Axis")
```
```{r echo=FALSE, message=FALSE, warning=FALSE, fig.asp=1, fig.width=3}
#| layout-ncol: 2
ggplot(data=data, aes(x=x, y=y)) +
geom_smooth(method = 'lm') + geom_point() + theme_classic() +
theme(axis.title = element_text(
size = 10)) +
ylab("Y-Axis") +
xlab("X-Axis")
ggplot(data=data, aes(x=x, y=y)) +
geom_smooth(method = 'lm') + geom_point() + theme_classic() +
theme(axis.title = element_text(
size = 10)) +
ylab("Y-Axis") +
xlab("X-Axis")
```
Would be happy for any help!

Answer 1

Ok, I finally just found the answer myself. When using #| layout-ncol and no fig.width is defined for that chunk, the ggplot seems to be rescaled in a way that results in smaller font sizes of the plots text elements. So the solution is just to always define a fig.width that fits the respective columns where ggplots are displayed. I think there is a clear explenation for that, but I don't it. :D