toggle between two functions:

https://codepad.co/snippet/yikUoeWP

//----------- shrink filterbox ----------------
 
 
$.fn.clickToggle = function(a,b) {
    function cb(){ [b,a][this._tog^=1].call(this); }
    return this.on("click", cb);
};

$(".clickme p").clickToggle(function(){
        	$( '.filterbox' ).addClass( 'shrink' );
  			$('div.elementor-portfolio__filters ul').hide(); 
        }, function(){
  			$( '.filterbox' ).removeClass( 'shrink' );
            $('div.elementor-portfolio__filters ul').fadeIn();
        });