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Four effects handle the look of a clip beyond color: blur and sharpen for focus, vignette for framing the eye, and crop for masking edges.

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Blur

Blur lives on the Transform sub-tab, next to scale and position. The Blur field sets a Gaussian blur radius from 0 to 64 pixels — 0 is fully sharp, and even a few pixels reads as soft focus. Blur is keyframable: click the diamond next to the field to set a value at the current frame, then set a different value later to animate a rack-focus or a defocused intro. Blur keyframes show up as their own row in the timeline’s keyframe view.

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Sharpen

Add Sharpen from the Effects rack. Its Amount slider (0 to 2) boosts edge contrast to recover crispness in soft footage. Push it gently — high values exaggerate noise and halo edges.

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Vignette

Add Vignette from the Effects rack to darken the frame’s edges and pull attention to the center:

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Crop

Add Crop from the Effects rack to mask the clip’s edges. Four sliders — Left, Right, Top, Bottom — each trim away a fraction of the frame from 0 (no crop) to 1 (the full dimension). The cropped area becomes transparent, so anything on tracks below shows through.
Crop trims within the clip’s own frame. To change how the clip fills the canvas instead, use the Fit setting on the Compositing tab.