Since the quiz loads from Radiopaedia directly, we need a bookmarklet to inject the CSS fix. Follow these steps:
Step 1: Drag this link to your bookmarks bar:
Clinical Details ON
(Drag this button to your bookmarks bar)
Step 2: Open a quiz case on Radiopaedia (click any quiz in the iframe below)
Step 3: Click the "Clinical Details ON" bookmark. It will auto-expand the clinical presentation and keep it visible.
Or copy-paste this into your browser console (F12):