The tools for the preview are located in the Live View menu.
Let's take a look at the function of each tool.
Rotate Right/Left rotate image by 90 degrees to the right or to the left. The image rotation is displayed on the preview and is taken into account in processing.
Reset Rotation is used to quickly return image to original position after one or several rotations.
The following set of tools is designed to work with exposure and lighting in the shot:
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Composition is the harmonious placing of the various image elements according to the author`s intention and allowing to fully deliver him thoughts and feelings to the viewer.