I recently bought Manga Studio 5 which is now called Clip Studio Paint Pro / Ex. When you install it you have a white theme as default.
I don’t know what your preference is but I like a darker theme which can be activated here:
After switching to dark theme it looks like this:
You also have the possibility to control the density of both theme with this slider:
Very easy to control these options if you know where to find it:-) Have fun with Clip Studio Paint aka Manga Studio 5: