# Structure Structure detection is the foundation of everything REx draws. This section controls which structural method REx uses — MSB or BOS — and how much historical data is shown on the chart. ***

*** ## What is Market Structure? Price doesn't move in straight lines. It sweeps highs, takes out lows, and creates ranges between those swings. Market structure is the map of those ranges. * A **swing high** is a peak flanked by lower highs on both sides. * A **swing low** is a trough flanked by higher lows on both sides. * A **range** is the area between a confirmed swing high and swing low after a break. When price breaks a swing, it marks a shift in momentum. That break — and the range it creates — is where REx draws your Order Blocks, Breaker Blocks, and key levels. ***


1.	`Mode` defines how market structure is detected and displayed. Both engines run simultaneously — this setting controls which one is shown on the chart.
	→ MSB — "Catch the turn early."
	→ BOS — "Follow the trend, skip the noise."
	The selected mode also determines where Order Blocks are placed — each mode uses a different structural reference point to define the zone boundary.

***


2.	`Hide Historical` removes past structure data from the chart, keeping only the most recent and relevant information visible for a cleaner view.

***