For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
echo $this->layoutFilters();
echo $this->loadTemplate('filter');
To just change it for a specific list template, copy it to ...
./components/com_fabrik/views/list/tmpl/<your template>/layouts/list/fabrik-filters.php