During my daily work I use, mainly, Visual Studio 2022. Since September 2021, Visual Studio has a good support for themes: read the announcement
However, it happens that I also have to work on frontend projects or some scripts for some of my colleagues.
For this reason I use Visual Studio Code for few hours each day.
But that's not all.
Basically I am a Full Stack Web Developer and some years ago I have found a good way to be more productive usin JetBrains Rider. Why? Because in the same IDE I have the power of a good engine refactory and intellisense and the power of good environment to write and debug code for Frontend (in my case React & TypeScript).
Before this way of work, I use Visual Studio and Visual Studio Code open on the same PC, but you waste a lot of time to switch from one project to another.
But with three IDE, I have found a new problem. Each IDE has different fonts, colors and other UI stuff. After a while I felt tired and my brain took a while to understand what environment I was in.
Finally I found the solution and it's called One Dark Pro.
I use the same theme for all IDEs on my machine and the same font as well (Cascadia Code).
In the image above you can see a preview of my three IDEs side by side. It looks like we're inside the same application.