The research that is currently implemented (like the Alt+Space shortcut for example) doesn't allow you to make modifications. But when you have a lot of abbreviations, it takes time to find the specific one you want to change.
A search box to look up and find shortcuts/text expansions would be very useful for people with a lot of these entries, to make modifications more easily.
Add a search box to search Shortcuts/text expansion
Have you tried searching with Edit/Find, Ctrl+F?