Feature Request: Add a variable select/deselect bar to the data viewer.


Dear,
Could we add a variable selection panel to the data viewer?
This would allow users to quickly isolate and focus on specific variables of interest. It would be extremely helpful for reviewing wide datasets with many columns.
like:

<img width="203" height="289" alt="Image" src="https://github.com/user-attachments/assets/2d33226d-ce27-4eb8-9340-53e56090ed97" />

