Since today my Visual Studio looks like that. The theme is still set to dark and I did Reset all settings.
Any Ideas why this looks like that or how I can change it back to the correct dark theme?
I wouldnât call this is a âCode/Scriptingâ issue.
Heck, I wouldnât even call it a Unity issue.
Visual Studio has theme editing capabilities, the backend of which is actually really convoluted. There are .vsix extensions you can download to customize it very specifically.
Iâm willing to bet somehow the configuration for darktheme got mangled in the registry in some way. Thereâs many ways it can happen⌠messing around in the settings, having multiple versions of VS installed, etc.
Iâd do a full uninstall, including purging the registry of all entries of Visual Studio 15.0 related stuff (thatâs 2017)⌠and if you have any other visual studio remenants laying around (14.0, earlier) get rid of that stuff as well. And do a whole new clean install.
Otherwise⌠install the theme editor plugin and edit away.
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Or go get Rider (seriously itâs pretty great)
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Rider doesnât appear to be free. At least VS is. 
For OP, yeah, that is odd. Maybe switch to another theme and switch back and see if that fixes it. But otherwise, try reinstalling it. Nice thing with VS 2017 is you can just install what you need for Unity if you wanted.
Rider is free - at least for now while itâs in early access
I must be looking at the wrong site then. https://www.jetbrains.com/rider/ Shows a free trial and paid plans only.
I downloaded it last week
Indeed - looks like it went to release last week. In either case - still great!
Wasnât the question about how to get VSâs dark theme to work correctly, and not how to promote other IDEs? 
As @lordofduct pointed out, this isnât a Unity issue, so try to reach out to Visual Studio on Twitter or via their forums.
However, I think I know what your issue could be: Go to Tools > Options > Fonts and Colors > (under Display Items) Plain Text. Change the âItem Backgroundâ color, then hit OK. The changes will NOT show without clicking OK (because itâs Microsoft and they think we donât need an Apply button anymore). I was able to get the same look with that setting IN dark mode:
Also you can click âUse Defaultsâ to reset the colors back to default, which look OK.
As for Rider, I think that unless they have some amazing features that VS doesnât have, itâs going to be a tough sell. Itâs free for 30 days, then $350 for 1st year, $280 for 2nd year and $210 onwards, while VS Community is free forever. For most people, thatâs a lot of money that could be saved by simply using Visual Studio. But thatâs just my 2 cents; and Iâve never used Rider.
Thatâs a business/org license. Individual is 139/111/83. And itâs free for students, teachers, and open source projects and 50% off if your business has existed for less than 3 years.
But yeah - a lot of it is personal preference. I like the way Rider does certain things over Visual Studio (and I used Visual Studio for years). And I use IntelliJ regularly so Iâm used to âthe JetBrains wayâ. Just for example - my folder structure doesnât match my namespace structure. Rider is smart enough to look at the namespaces of other classes in the same folder and determine what namespace to put my new class in. Itâs a little thing but recently I redid our entire UI so I was making a bunch of small components to plug into UI elements to give them functionality. Not having to delete the auto-generated namespace to put my own in there saved me a ton of hassle.