I'd like to be able to check if certain strings exist within my app, in either the "designer" or the "blocks" view. Any attempt to search for how to do this gives results that are for handling strings using one's app. I wasn't even sure how to phrase the subject line of this post to convey what I …

You could always download your project to an aia file, open this up, and find the bky and/or scm files. Carry out text search on these files should return your string locations....