Hello
Is it possible to extend file name searching field ? Actually it is quite small and sometimes I can't enter all title I am searching.
Regards

No, all you can do is shorten the title. Don't use "the", "and", or other unnecessary words.

Even if you could type in the exact, complete title, LW would give you search results that match key words; you'd still get a variety of results.

But sometimes my titles are very long and I would like to have only search results of my interest.