Also having Ginormous icons – this is in the WordPress back-end, should not conflict with any themes. If I inspect the large icon, the item is
<path d="M99.59,41.42a2.06,2.06,0,0,0-1.37-.82L86.3,38.78a39.34,39.34,0,0,0-2.67-6.39q1.17-1.63,3.52-4.6t3.32-4.33A2.52,2.52,0,0,0,91,22a2.1,2.1,0,0,0-.46-1.43Q88.18,17.2,79.78,9.45a2.52,2.52,0,0,0-1.63-.65,2.12,2.12,0,0,0-1.57.59l-9.25,7a40.09,40.09,0,0,0-5.87-2.41L59.64,2a1.92,1.92,0,0,0-.75-1.4A2.46,2.46,0,0,0,57.29,0H42.82a2.19,2.19,0,0,0-2.34,1.82,106,106,0,0,0-1.89,12.12,37.62,37.62,0,0,0-5.93,2.48l-9-7A2.78,2.78,0,0,0,22,8.8q-1.44,0-6.16,4.66a64.88,64.88,0,0,0-6.42,7A2.75,2.75,0,0,0,8.8,22a2.44,2.44,0,0,0,.65,1.56q4.37,5.28,7,9a32.38,32.38,0,0,0-2.54,6L1.76,40.34a2,2,0,0,0-1.24.85A2.5,2.5,0,0,0,0,42.69V57.16a2.44,2.44,0,0,0,.52,1.53,2,2,0,0,0,1.37.82l11.93,1.76a31.91,31.91,0,0,0,2.67,6.45Q15.31,69.35,13,72.31T9.65,76.65a2.54,2.54,0,0,0-.07,3q2.54,3.52,10.75,11a2.25,2.25,0,0,0,1.63.71,2.35,2.35,0,0,0,1.63-.59l9.19-7a40.54,40.54,0,0,0,5.87,2.41l1.82,12a1.92,1.92,0,0,0,.75,1.4,2.45,2.45,0,0,0,1.6.55H57.29a2.2,2.2,0,0,0,2.35-1.82,107.41,107.41,0,0,0,1.89-12.12,37.19,37.19,0,0,0,5.93-2.48l9,7a3.18,3.18,0,0,0,1.69.59q1.43,0,6.13-4.62a65.86,65.86,0,0,0,6.45-7,2.16,2.16,0,0,0,.59-1.5,2.51,2.51,0,0,0-.65-1.63q-4.69-5.74-7-9a41.57,41.57,0,0,0,2.54-5.93l12.06-1.82a2,2,0,0,0,1.3-.85,2.52,2.52,0,0,0,.52-1.5V43a2.46,2.46,0,0,0-.52-1.53ZM61.85,61.86a16.08,16.08,0,0,1-11.8,4.89A16.69,16.69,0,0,1,33.37,50.06,16.69,16.69,0,0,1,50.06,33.37,16.69,16.69,0,0,1,66.74,50.06a16.08,16.08,0,0,1-4.89,11.8Zm0,0"></path>
And there seems to be no size declaration and on screen it’s 1170.08 pixels square.