The Preset Selection window uses the advanced search bar which has a larger font than regular search boxes to accommodate for additional features.
How to reproduce:
1. Create a new Unity project and a new scene in it
2. Select the "Main Camera" GameObject in the Hierarchy
3. In the Inspector, on the "Camera" Component click the settings icon near the three-dot menu to open the "Select Preset" window
4. Observe the font in the Search field
Expected results: The Search font matches the overall size of the Editor
Actual results: The Search font has a noticeably bigger font