Within Writers Vault, the platform there are two default themes, these are colour preferences which change the sites views from a white or Light Theme to a grey or Darker Theme. There is no difference in functionality between these, the view is The difference is purely preference and a visual change.
Some people use the Light Theme purely for the daytime and switch to the Dark Theme for the night or if you prefer one specifically, just stick with that. To change it, it’s just the touch of a button.
If you are a PREMIUM customer, you can set it to remember your theme choice whenever you log in to the platform. To do this visit My Account, then Settings, then Remember My Theme Options and pick which one suits you. Then, when you log in with that account it will remember it.