Have you made sure to follow all of the steps outlined in that component? You also need to enable a dark theme needs to be at: /admin/site_settings/category/basic?filter=dark
I haven’t had an issue with this, even with sidebar enabled.
Unfortunately no, there isn’t a way to change this. Would it be possible for you to label them as 01, 02, and so on? Without the world module attached?
The dimensions are 132x132.
Would you mind sharing a screenshot of what is happening here? I havent noticed this on my demo site.