Recent posts widget / Recent posts widget title

On the blog at '/blog', I have a sidebar with recent posts. It got carried over from before widgets became 'blockerised'

Now I am trying to alter the number of posts shown in the widget and I cannot see anywhere to do it?

If there isn't a way to do it then I am tempted to disable the block editor in widgets, as per your page at https://docs.generatepress.com/article/disable-the-block-editor-in-widgets/