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
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This does not work since the text of the button is generated from the label...Just leave the label blank.
-- hugh
Thanks! This worked. Now to get my button javascript to actually work...You can hide it with CSS, there's an element class in the parent div.
.fb_el_your-full- element-name_ro .fabrikLabel {display:none;} (or visible:hidden; if you want to keep the space)