Check screenshots above. There is a block having 4-columns layout. Each column there a) is flexible and b) uses min-content constraint. So widths of columns ar

Check screenshots above. There is a block having 4-columns layout. Each column there a) is flexible and b) uses min-content constraint. So widths of columns are unknown upfront - determined by actual content in grid cells. That last part (use of actual content) is what you cannot reproduce using % units in principle.