Edit box-header on WordPress Dashboard

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In my theme, I’m working with two featured images. One in square shape (preferably 500*500) and one in widescreen (1920*1080 for example).

However, it’s not clear where which image has to go, when I make a new post, so I am looking into changing the title element of a box on the dashboard, so it’s clear which image goes where.

See attached screenshot. I would like to add 500px*500px after Featured Image, but I can’t find out where I do this.

I tried by just adding it to my CSS file (with an :after-element), but it then hit me I can’t target the WordPress dashboard with the theme’s CSS files.

Read more here: Edit box-header on WordPress Dashboard

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