Zoom in, Zoom Out and Step by Step Buttons on MT4 Charts
This option is located on the charts menu within the MetaTrader 4 Platform. This option is used to zoom in the charts as shown below, some traders may choose to magnify a chart and trade when the charts are zoomed in depending on the preference of a trader.
Short Cut Key (+)
Zoom in The Forex Candlesticks on the MT4 Platform
This option is located within the menu as shown below; this option is used to zoom out charts and is used by traders who prefer to trade the chart using minified charts according to their preference. This option is shown below.
Short Cut Key (-)
Zoom out the Forex Candlesticks on MT4 Trading Platform
Step by Step
This option is used to back test trading systems by moving the charts one candlestick at a time and then analyzing when to buy and when to sell a currency based on the trading system being back tested. To learn more about this button, Read the article: Back testing a Trading System using MetaTrader 4 Step by Step Button - its short cut is key is "F12"
Step by Step button for moving Forex Charts One Candlestick at a Time