When clicking on Geometric search (3D) the same-named dialog box opens.
Call dialog box "Geometric search (3D)"
On the tabbed page 3D files you can hide the buttons Load geometry and Geometry from CAD via config key:
Load geometry:
[SettingsSearch] LoadGeometryEnabled=0
1: show
0: hide
Geometry from CAD:
[SettingsSearch] LoadFromCadEnabled=0