The XSMP has a user-friendly bookmark manager for user scenes. It can be used not only for custom preview scenes, but also for other more frequently used scenes.
Scenes Bookmark Manager divided into four panels:
1. Bookmark categories list.
2. Scenes bookmarks list.
3. Scene status and info panel.
4. Bookmark description.

Renaming or deleting a bookmark has no effect on the scene file itself.

To assign a file as a custom rendering scene, simply select Set as custom rendering scene from the context menu. The icon for this scene will appear in a brighter color in the list.
Only one scene bookmark can be specified as a Custom scene at a time.

It is essential that the scene is optimised for faster rendering.
The object to which the material will be assigned must be named "Material_Object" or specified in the LAB Settings field Custom Scene Object Name. The name is case-sensitive! Otherwise XSMP will not find the object to which the material will be assigned and an error will occur.
Use the same units in which you created the material.