You need to have Power Scripts for Confluence app installed in your Confluence instance to implement the below.
The below SIL script will delete all labels from a page in a Confluence instance:
//get page number page = getPage("TST", "This is a demo page"); //set the labels to empty string -> which deletes all labels of the page %page%.labels = "";
Replace
TST
with the key of Space where the desired page exists.This is a demo page
with the title of the desired page, whose labels you want to delete.
Here’s a screen recording showing the above script in action: