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If that doesn't fix it, then toggle whether "Windows" > "Engine Window" > "Auto Hide Engine Window" is enabled at the top-left of Source Filmmaker's main window.
This seems to fix it for some people, but not for everyone. Even then, having it enabled fixes it for some people while having it disabled fixes it for other people.
Also see the pinned thread about this issue, called "Blinking/Flickering Viewport: Possible Cause and Solutions".