Question

name the process in which, by clicking the minus (-)sign, it changes to plus (+)sign and contents of the folder get hidden

Answer 1

The process is termed as collapsing. When the one clicks on the (-) sign in a list on a panel in a computer, the branches within the root folder are compressed such that only the root folder is visible and has a (+) sign on it. 
The opposite of this is expanding, where you click the (+) sign and the branches in the root folder line up and are visible while the root folder obtains a (-) sign in case you want to collapse it again. 

Answer 2

Answer:

ANSWER:

this process is know as collapsing

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