How to hide value at drill down level?

There is as sticky tape solution to this:
considering it is a matrix/table visual, select the visual, then we can go to the Format option, Field Formating:

in Field formatting, click on drop down(as shown in the image) and select the column for whose value u need to change)

after selecting the column, change the Font color of the text to White:

By this way, the values won't be seen/hidden.

If this post helps you, then please consider this and accept it as a solution to help other members find it faster. Also, hit a thumbs up if it solves your query. 
Regards,
TruptiS

I thought about this but was wondering if there was a better way. I am marking this as solution. Thanks!