You can modify the size of the panes, the size of the preview thumbnails, and re-arrange the order the preview thumbnails.
To modify the size of the panes:
- Click on one of the rounded pane size anchors (see screenshot above)
To modify the size of the preview thumbnails:
- Click on one of the sizes in the preview size controller (see screenshot above).
To re-arrange the order the preview thumbnails:
- Drag and drop the preview thumbnail to the desired position within the pane.