Question

on clicking the Plus sign, subfolders Get displayed and the sign changes to minus sign. this is called.........​

Answer 1

Answer:

Collapse

Explanation:

Clicking the minus sign will collapse the folder, removing the indented subfolders from the hierarchy of folders. The minus sign changes to a plus sign.

A plus sign to the left of a folder name indicates the folder consists of one or more subfolders  that are not visible in the tree. Clicking the plus sign will expand the folder, displaying its  subfolders and changes to a minus sign.