If you have longer layer names that you'd like to see more easily in the plugin exportable image list, you can toggle the width of the Figma plugin window by by pressing the Shift + W keyboard combo shortcut while the plugin is running (and focused).

Your expanded window size setting will be automatically saved between plugin runs inside the Figma file, so the plugin window will either be normal width or the expanded width based on the last time you toggled it in the current Figma page.