primefaces global filter without the column filters

Make sure you have the filterBy="#{myRowVar.sonmeField}" in every p:column (because the global filter needs it)

And also add the filterStyle="display:none" in every p:column (adding of filterStyle="display:none" will make it not visible...)

or you can just put:

.ui-column-filter{
     display: none !important;
}

in your .css to hide all column filters