How to increase size of center button icon.

I have added icon with size 290*230 pixel in drawable - xhdpi then also size has not been increased. I had also added this property in xml app:space_item_icon_only_size="40dp" which increase other item size but does not increase center button size.

Reproduce the issue using the 290×230 drawable in drawable-xhdpi and the app:space_item_icon_only_size="40dp" XML property. Trace how the center button icon is loaded and sized, then verify that the center icon can be increased independently of the other navigation items.

Written by the indexing model from the issue text.