You cannot hide both your balance and your equity. If you are publishing your results for other people to look at then it makes a material difference whether a return of e.g. 50% has been achieved on a deposit of $100 or $100,000.
MT4 users can hide their equity but not their balance by using the publisher EA (not account sync) and turning off the IncludeOpenProfit parameter in the EA. This option is not currently available on any other platforms.