There's no baked in way to get that kind of permissions control. It's either all-or-nothing when it comes to the ACP.
ACP Styling
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Any resources on this? Going from 100% dark front end to ACP is literally killing me.
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There's no built-in way to do this at the moment, but you could use a userstyle. Something like https://addons.mozilla.org/en-US/firefox/addon/styl-us/ maybe? That would require you know how to use CSS.
If you'd like a dark theme in the ACP you could make a feature request on our Github issues page.