Besides the Mini-Browser, there are three Full Browsers built into Omnisphere, one each for Multis, Patches, and Soundsources. All three Full Browsers have identical functions, but access different parts of the Core Library.
Anywhere that you see a Folder icon, you will be able to access that Browser by clicking on the Folder. If there is a Name Display next to the Folder icon, you can also click inside the Name Display to open the Browser.
When any of the Multi pages are selected (Mixer, FX, Live, or Stack) the Mini Multi Browser will be displayed on the left. The Full Multi Browser can be accessed from the Header, or by selecting the magnifying glass icon next to the Mini Multi Browser name display.
The Mini Patch Browser is automatically displayed on the left area of the interface when any Part page is selected.
The Full Patch Browser can be accessed from any Patch Name Display (including the ones in the Mixer Page) from the LIVE MODE page when Mixer Controls are enabled and from the STACK MODE page by right-clicking on a region. It can also be accessed by selecting the magnifying glass icon next to the Mini Patch Browser name display.
The Soundsource Browser is accessed by clicking on the Soundsource image in the center of the Layer Pages when the oscillator is in SAMPLE mode. It can also be accessed by clicking on the Soundsource image in the Main page under the Layers tab.
To learn more about the Browsers in Omnisphere, please see the Browser section of the Reference Guide.