Currently, the column list disappears into a drop down list as soon as you add any more than three columns, to the plot axis.
My request is based on a personal opinion that changing this number from three to maybe six/eight or letting this number be a user controlled feature, would help with keeping the UI flexible for users that desire to have access to drag-changing the column hierarchy or even edit, with fewer clicks.
Please refer to response on question raised: (Screenshot of problem description, attached here as well)
https://community.tibco.com/questions/there-way-keep-column-list-visualization-expanded-instead-shrinking-it-drop-down-list