The default columns arrangement is such that attributes are the first column. See first attached image.
Resize the Ext column making it a tad wider.
The first column containing attributes becomes hidden. See second attached image.
Stretching the left-edge of the Size column shows the attribute column but as soon as the mouse button is released, the attribute column is hidden again. Can't seem to make the first column reappear without exiting and restarting MultiCommander.
As can be seen from the column customization dialog (third attached image), the attribute column width is still set to 70.