Enable Or Disable "All" Option
Follow these steps to enable or disable the option for the visitor to select "ALL". Remember to update or publish your work as you go.
1.) Choose Filter Type.
Make sure you choose the Checkbox / Radio Filter Type.
2.) Select All Or Hide All.
The next step is to head down to the Checkbox / Radio Filter Options tab and select Choose One from the Functionality dropdown. If you want to hide all then enable the High All Option.