Below you can see the front-view size comparison of the Olympus TG-5 and Fujifilm X-T100. The Olympus TG-5 is clearly the smaller of the two cameras. Its body is 8mm narrower, 17 mm shorter and 15 mm thinner than the Fujifilm X-T100.
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.