ref:https://www.reddit.com/r/xfce/comments/94qwuo/when_is_thunar_finally_getting_a_search_file/
You can create a shortcut in Thunar’s right click menu via the “Edit” -> “Configure custom actions…” menu.
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Name:
Search files...
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Command:
catfish --path=%f
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File pattern:
*
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Appears if selection contains:
Directories