Chart settings is where you control what appears on the chart. The defaults are sensible for a new account, and changing them does not affect anything except the display.
Useful toggles
Symbol name, last price, and bar countdown. Show or hide each on the chart.
TP/SL Background (under Labels, on by default). Turn it off and the colored fill behind your take-profit and stop zones goes away, leaving just the lines and labels.
Market Order Preview (under Labels). Off by default. Turn it on to draw a projected entry line for market orders.
Trade Executions. Shows your fills on the chart as arrows with quantity and price. On by default.
Pin Out-of-Range Lines. Off by default, so lines that scroll off-screen hide instead of sticking to the chart edge. Turn it on to keep an important level (like a liquidation price) pinned at the edge where you can still see it.
Buy and Sell colors. Change your Buy / Long and Sell / Short colors.