Emulator

Dolphin 5.0-4871 on Windows

The game list which appears when Dolphin is launched has columns for console type, banner image, title, maker, etc.

If you move the mouse over the list header bar, you can double-click between columns to auto-fit the width of the column to the left. Or click-and-drag to adjust the column width manually.

While the widths of the console type and banner columns can't be manually adjusted, you can double click to auto-fit. But the auto-fit widths for those columns are incorrect; a little extra/empty space is added to the banner column width, and a lot of empty space is added to the console type column. After auto-fitting you can't reduce the widths of those columns back to the default.