> ## Documentation Index
> Fetch the complete documentation index at: https://docs.myresearchlab.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Themes

> Control how the study looks to participants.

A **theme** controls the visual presentation participants see when they take your study — colors, type, and overall feel — separate from the study's content and logic.

## Applying a theme

In the Builder, open the appearance/theme controls to set the study's look. Use **Preview** to see exactly what a participant will see.

## Why it matters

* **Consistency** with your materials or institution.
* **Stimulus fidelity** — for social-media or interface studies, a clean, neutral frame keeps the stimulus (not the chrome) the focus.

## Reuse

Saved themes live in the **Library → Themes** so you can apply the same look across studies rather than re-styling each one.

<Note>
  Theme changes are purely presentational — they never alter which blocks a participant sees or how data is recorded.
</Note>