I believe that this is something that has been posted in the ideas tab multiple times but has not been added yet. 

@JAiello 3501f07 sd13 Thank you for submitting your question to our community!

An idea that would solve this request is currently being developed. It is coming soon. Follow this thread to have the most up-to-date information: 

Please, we need this.

@DYu 5900af1 ccps thank you for adding your feedback! It is currently in development and will go live, hopefully, soon. 

@JAiello 3501f07 sd13 

I have some exciting news to share with you! Global Search is now live in production for all districts, including yours! This enhancement allows you to search comments in open tickets. 

Learn more about Global Search here!