Is absolutely terrible for user experience. As an experienced administrator/user, even I forget to look up in the top left corner for the tiny spinning circle, instead I'm left wondering for a moment if the data has loaded.
This needs to be made more prominent. I wasn't a fan of the thin pink line of previous versions, but that was much more noticeable than the current grey square 22px circle against a black background.
Thank you for letting us know your user experience is less than ideal. Our design team is working on improving the loaders indicators in general all across the platform. In future releases, you'll see improvements around this area.
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