Show a preview of the start or end frame while transforming a strip’s start/end handles.
Zoom and position the bounding box of the selected image into the center of the preview.
Fit Preview in Window Home
Resize the preview so that it fits in the area.
Click and drag to draw a rectangle and zoom to this rectangle.
Resize the preview in steps from 1:8 to 8:1.
To force Blender to re-read in files, and to force a re-render of the 3D Viewport,
click the Refresh Sequencer button.
Blender will update and synchronize all cached images and compute the current frame.
Certain operations, like moving an object in the 3D Viewport, may not force the Sequencer
to call for a refresh of the rendered image (since the movement may not affect the rendered image).
If an image or video, used as a strip, is changed by some application outside of Blender,
Blender has no real way of being notified from your operating system.
Sequence Render Image
Render the image at the current frame.
Sequence Render Animation
Render timeline from Preview Start to Preview End Frame to a Video file or series of images.
Exports Text strips,
which can act as subtitles, to a SubRip file (.srt).
The exported file contains all Text strips in the video sequence.
Toggle Sequencer/Preview Ctrl-Tab
Switch the editor display type between Sequencer and Preview.