One cool thing about the new  Adwaita 1.4 layouts is that you can make windows so much smaller before the sidebar folds, in part also because sidebars can grow/shrink dynamically. I love how cute these look with the narrow sidebars :)

https://files.mastodon.social/media_attachments/files/111/065/293/375/359/652/original/ff3ef1aebbd79d57.png 

 @6fb50f0b is not being able to resize the sidebars anymore a design decision or just not implemented yet? such as Nautilus, the GTK4 file picker lets you resize still, Nautilus does not.