Improve Plot Selector Usability

[lluddenusgs]

Description:
The plot selectors appear disconnected in certain notebooks (e.g., 1b.py). They do not provide a fluid user experience. Notebook 3b seems better, possibly due to Python widget placement or could just be the type of widget. Investigate and propose solutions to improve interactivity.

Tasks:

• Review the plot selector implementation in 1b.py.
• Identify issues causing the lack of fluidity.
• Propose and implement a workaround or improvement to ensure better widget placement.
• Validate usability against 3b.py for consistency.