Is your feature request related to a problem? Please describe
In the example shown in the screenshot below, the limited width of the left-hand panel makes it harder to distinguish between several variables in the CF Standard Name search box.
Describe the solution you'd like
Instead of the search selection panel having a fixed width, it would be good if the user could change the width, by dragging horizontally the vertical line to the right, which separates it from the search results panel.
Describe alternatives you've considered
none
Additional context
none