Cross-fading creates shapes and distributes them by uniform increments between two drawing objects.
The cross-fading command is only available in LibreOffice Draw. You can, however, copy and paste cross-faded objects into LibreOffice Impress.
To cross-fade two objects:
Hold down Shift and click each object.
Choose Edit - Cross-fading.
Enter a value to specify the number of objects between the start and end of the cross-fade in the Increments box.
A group containing the two original objects and the specified number (increments) of cross-faded objects is displayed.
You can edit the individual objects of a group by selecting the group and pressing F3. Press CommandCtrl+F3 to exit the group editing mode.