When designing complex molecular models, one of the biggest challenges for modelers is navigating the risk of making mistakes that could compromise hours of work. Imagine you’re designing a molecular structure with intricate interactions and suddenly realize you’ve applied an incorrect transformation several steps ago. SAMSON offers a practical solution to this common pain through its Undo and Redo functionalities, ensuring that you can explore, experiment, and iterate with confidence.
How Does Undo and Redo Work in SAMSON?
SAMSON provides a robust history management system designed to handle most operations, allowing users to move backward and forward through their actions. Each document in SAMSON maintains its own independent history. This makes it easy to track and modify only the relevant operations within a specific molecular model without affecting other work.
The History view provides a visual representation of these undoable actions. To open it, you can navigate to Interface > History or use the convenient shortcuts:
- On Windows and Linux: Ctrl + 3
- On Mac: Cmd + 3

Effortlessly Navigate Through History
The ability to Undo (Ctrl/Cmd + Z) and Redo (Ctrl/Cmd + Y) directly from the Edit menu or by interacting with the History view allows molecular modelers to focus more on creativity and problem-solving instead of worrying about potential irreversible actions. Simply click on any action in the History view to move through the states of your molecular model, revisiting or modifying past points.
What to Keep in Mind
It’s worth noting that not all operations in SAMSON are undoable. For instance, if certain operations that are non-undoable are performed amid undoable ones, it may limit SAMSON’s ability to undo the previous steps appropriately. To minimize inconvenience:
- Be mindful of which operations you perform and try grouping experimental changes within undoable categories if possible.
- Check your progress regularly using the History view to ensure that critical points are saved as part of your document’s timeline.
While this limitation exists, SAMSON’s intuitive interface ensures you retain control over most of your workflow without significant interruptions.
Why It Matters for Modelers
Whether you are a molecular designer exploring properties of a new drug candidate or fine-tuning the structure of a nanosystem, the Undo and Redo feature makes the modeling process much less intimidating. It empowers you to test hypotheses and push the limits of innovation fearlessly while reducing the risk of unintentional data loss. Use SAMSON to iterate efficiently and focus on creating groundbreaking molecular designs.

To explore more about SAMSON’s History features and understand how to integrate them into your workflow, visit the official documentation page: SAMSON History: Undo and Redo.
SAMSON and all SAMSON Extensions are free for non-commercial use. You can get SAMSON at SAMSON Connect.
