The show items containing field is disabled where there are more than 3,000 entries.
Relax this restriction to a higher number or move it to the admin settings so the value can be increased for particular installations.
The where filter is not of much use because the field wanted to be searched doesn't contain spaces and wildcards are not allowed at the start of the search term.
If I wanted to search for PR_8 then I would also need to include the full prefix
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