Sharing the answer that I just found, in case it helps someone. In the R2022b Find & Replace dialog, to the right of where you enter your search phrase, there is a symbol (underlined Ab) that you click to select or deselect the "Whole Word" option. So, it is there, just a bit more cryptic. And deselecting "Whole Word" does allow me to search for phrases inside of words.
How to deselect "Whole Word" option in editor search in R2022b?
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I am having trouble with the editor search in R2022b, accessed from CTRL-F from within the text of a mfile. If I search for a phrase such as "my_file" when the whole word in the editor is "my_file_is_being_edited", no hits are returned. When I was using R2016, I had this same problem; the solution was to uncheck the "Whole Word" checkbox at the bottom of the Find & Replace dialog. Unfortunately in 2022b, the Find & Replace dialog has no "Whole Word" checkbox. How can I deselect the "Whole Word" option in R2022b?