Click Adjust in the toolbar to show adjustment options in the Adjust pane, then do any of the following:
Apply a vignette: Click the Vignette adjustment, then use the controls to achieve the look you want. See
You can trim a video clip so that it starts and stops at specific places. Trimming a video clip doesn’t actually delete footage; you can recover any trimmed video later.
In the Photos app Edit a Cinematic mode video in Photos on Mac