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Preview your project.

Article:
Select "Windows." From here, click on "Time Controls." A preview pane will pop up where you can select "Play" to see a rough draft of your project. If you wish to see a more finished version, click on "Ram Render Play." If your project is especially long or requires a large amount of memory, adjust the resolution before you preview it. After clicking to play it, the video will run continually until you click on the screen to stop it.