How do I remove the extra lines from the chart: Last price, Mark price, the order history?

Q: How do I remove the extra lines from the chart: Last price, Mark price, the order history?

In “Graphics settings”, the “Lines” block: untick “Last price line” and “Mark price line” (both are on by default); “Hide the repricing trail” is there too. How many closed orders to draw is set by the “Closed on the chart, at most” field in Settings → Order lines (default 500). The order book width is “Width” in the “Order book” block of the same panel. The panel's settings apply to the current tab.

Graphics settings

Click a row — or a control on the picture — to read what it does.