Below you can see the front-view size comparison of the Fujifilm X-E3 and Fujifilm X100F. The Fujifilm X-E3 is clearly the smaller of the two cameras. Its body is 6mm narrower, 1 mm shorter and 9 mm thinner than the Fujifilm X100F.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.