Windows 11: Settings → Apps → Default apps → choose browser under “Set defaults for applications”
Windows 10: Settings → Apps → Default apps → set default by browser type or file/protocol
macOS: System Settings → Desktop & Dock (or Desktop & Dock/Default web browser) → Default web browser → select browser
Chrome (Windows/macOS): Open Chrome → Settings → Default browser → Set as default
Firefox (Windows/macOS): Open Firefox → Settings → General → scroll to “Default Browser” → Set as Default
Edge (Windows/macOS): Open Edge → Settings → Default browser → Set as default
Android: Settings → Apps → Default apps → Browser app → select browser
iPhone/iPad (iOS/iPadOS): Settings → (scroll) to your browser → Default Browser App → select browser
Samsung Internet (Android): Settings → Apps → Default apps → Browser app → select Samsung Internet