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In Vaadin 25.0 the themes are just stylesheets that are added with @StyleSheet or page.addStyleSheet(), thus the "theme selection" feature becomes easy doable with a standard API. We should mention this on the high level as a concept. Here is an example (but can be polished/improved):

var remover = page.addStyleSheet(Lumo.STYLESHEET);
page.setColorScheme(ColorScheme.Value.DARK);
new Button("Change to Aura and light", click -> {
   remover.remove();
   page.setColorScheme(ColorScheme.Value.LIGHT);
   page.addStyleSheet(Aura.STYLESHEET);
});

Could go under https://vaadin.com/docs/latest/styling/advanced/dynamic-stylesheets.

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