Make size and transparency of points for molecule representation adjustable

[BeatEhrmann]

Description:

To enhance the clarity and usability of the view, it would be helpful to allow the size or transparency of the points representing the molecule to be adjustable.

Suggested Improvements:

1. Add controls to adjust the size of the points representing molecules in the graph.
2. Add controls to adjust the transparency of these points.
3. Ensure that these customizations improve the visibility and overview .

This feature would provide more flexibility in visualizing the data and make it easier to manage complex datasets.