Currently, the size of the grouping bar buttons will be calculated based on the width of the table and count of the buttons. And each buttons have minimum width (90px). If the calculated width is less than its minimum width then the button will be wrapped to next row. And, the height of its axis will be adjusted. If the text inside the button will be truncated with ellipsis if the text is overflow. But the entire text can be shown in tooltip by hovering the button. But in filter axis, the buttons will display filter status along with the text.
So, for this axis buttons alone we need to increase its minimum width to show few more characters.