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@Ganesh, I am not sure what set-up this is for, but your instructions fail at step 2 in the modern experience as there is no "return to classic experience" option. Also you add target audience sections in the page menu from the site contents screen.
As the fields (There are around 80 of them) which I want to hide are all drop down boxes - could I add a default value of "Select Option" which will then allow the field to show and then be hidden when the intial field which is also a drop down box has its option (From around 70 options) selected?