Hi,
The redirection on return key or by clicking the magnifier icon should work even if there is no keyword entered. Make sure that the minimal character count for trigger is set to 0 (as by default): https://i.imgur.com/cHyiwTr.png
That way the plugin should recirect even if there is no keyword.
Unfortunately currently there is only a LESS or MORE operator available, but I think this is a really great idea to add both equal or less and equal or more as well. I will make sure to implement this in the next release.
Best,Ernest Marcinko
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