Zoom in, Zoom Out and Step by Step Buttons on MT4 Charts
Zoom In
You may find this option under the trading charts menu of the MetaTrader 4 Platform. Depending on the preferences of a forex trader, some traders may choose to magnify a chart and trade when the charts are zoomed in using this option, as seen in the illustration below.
Short Cut Key (+)
Zoom in on candlesticks in the MetaTrader 4 software.

Zoom Out
This option is located within the menu just as shown: this option is used to zoom out charts and is used by those traders who prefer to trade and analyze the trading chart using minified charts in accordance to their preference. This option is shown below.
Short Cut Key (-)
Zoom out the Candlesticks in MT4

Step by Step
This function is utilized for system back-testing by advancing the trading charts one candlestick at a time, subsequently analyzing the optimal moments to buy and sell a currency based on the system under evaluation. For further insight into this feature, consult the tutorial: Back testing a Strategy using MT4 with the Step by Step Button - the associated shortcut key is "F12."

Step by Step button for moving Charts One Candle at a Time
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