Creo View Find "Match whole word only" is greyed out

[PTerribleCAD]

Does anyone know why the "Match whole word only" option would be greyed out in the Creo View Find tool? I am unable to find a setting to turn that on. I am using Creo View Lite.  

[VladimirN]

Take a look this tip - "About Managing Search Queries": https://support.ptc.com/help/creo/view/r9.1/en/index.html#page/creo_view/visualization/creo_view/About_Managing_Search_Queries.html# 

[PTerribleCAD]

I should have been more specific. I am searching a drawing rather than a model. I'm wanting to find an exact text string within the various drawing annotations.

[PTerribleCAD · Accepted solution]

Solution: open Acrobat, edit preferences...Select Security (Enhanced)...Clear Enable Protected Mode at Startup...Click OK.