Symbol Handles
Symbols that have a length or a size, such as crescendo/diminuendo, slurs/ties, image files, or bars, have handles that allow you to resize or edit the symbol.
Note
Do not try to move symbols with handles by dragging them by their handles. This changes its shape or resizes it instead of moving it.
You can select these symbols by clicking on them.
To select slurs and ties, click their end points, or draw a selection rectangle.