These arrows represent your chart trading history in TradeLocker:
Empty arrows indicate your open positions.
Filled arrows indicate your closed positions.
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If you'd like to turn this history on or off, here are the quick steps:
Click the 'Settings' icon on your chart.
Navigate to the 'Trading' section.
You will find the 'Trades on chart' toggle button there.
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Read more in our guide: Trading History on Chart