Hide some Categories from the Submit Listing Options

[unitehearts.in]

In my setup the Categories are shown when I press Submit Listing
I dont want some Categories to be shown, neither their names|pictures, nor in the Category dropdown.
I saw a post here with some code. It didnt work for me.

Hide specific categories on Add Listing

Hi, I would like my users to be able, when submitting a listing, to choose just some specific categories and not any of them. I don’t want to manually delete the categories I am not using cause I could use them in the future so I just want my users to be able to choose between some categories and hide the others from the Category selection dropdown in the Add listing form. Ty!!

Anyone who managed to do this, kindly help.
My Premium Support has expired so I am not requesting for help from the Support Team.
Thank you.