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sidebar_position: 1
sidebar_label: Overview
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# Overview
When you open a mode, viewport, toolbar and panels of the mode get shown.
It is important to note that each mode has a different UI, which serves its purpose.
Here we explain various components of `Basic Viewer` mode which includes measurement
tracking functionalities.

Basic viewer mode (longitudinal):

![user-viewer](../../assets/img/user-viewer.png)

Let's break different aspects of the viewer to the main components:

- Left Panel (study panel): displays series thumbnails with series details
- Viewport: renders the image and displays annotations
- Right Panel (measurements): displays annotations details
- Toolbar: displays tools and logo

![user-viewer-components](../../assets/img/overview.png)




Now, we explain each component and its sub-elements in detail.