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From the screen shot it appears that the environment which left navigation menu is a Fresh Install and the one with older style of menus is an upgrade. However this is configurable. The Smart Reporting Admin can select following menu,
Administration -> Configuration -> General Settings.
Over there you will get an option of setting "Navigation Style". The two options are ,
1. Left Side Navigation
2. Toolbar Navigation
You can choose any one of them based on your preference.