Hello Deriv Community,
If you are wondering , what are the option in the setting tab, this article might help you 
Options available in the settings tab are:
Advanced mode: By enabling the extended view, the tab displays additional information about symbol ie;: spreads, time, high and low prices.
Order sounds: sound notifications of trade activity ie; opening/ modifying/closing positions, placing orders, etc.
One Click Trading: platform allows performing trade operations in one click without additional confirmation from the trader
MetaQuotes ID: This is the unique identifier for receiving notifications.
Vibration: The options are for receiving push notifications are; never use vibration, silent mode only and always use vibration.
Notification ringtone: Used to choose a sound that will be played when a push notification is received.
Content auto-download: This enables automatic download of media when the device is connected to Wi-Fi.
Language: Users can switch between the 25 languages
OTP: One time password generator for a validation code as an extra layer of security from unauthorised access.
Enable News: Enable or disable delivery of newsletters to the mobile app.
Tablet interface: Enable this to switch from portrait view to landscape view.
Choose theme: Switch to dark mode or lightmode as needed
If you have any questions, please visit our Help Centre or contact us via Live Chat and WhatsApp.