in css tab column width(rel) change to 3 or more, see the inside de theme.css
.nt-flexwidth-01{flex-grow:0.1;}
.nt-flexwidth-02{flex-grow:0.2;}
.nt-flexwidth-025{flex-grow:0.25;}
.nt-flexwidth-03{flex-grow:0.3;}
.nt-flexwidth-033{flex-grow:0.33;}
.nt-flexwidth-04{flex-grow:0.4;}
.nt-flexwidth-05{flex-grow:0.5;}
.nt-flexwidth-06{flex-grow:0.6;}
.nt-flexwidth-066{flex-grow:0.66;}
.nt-flexwidth-07{flex-grow:0.7;}
.nt-flexwidth-075{flex-grow:0.75;}
.nt-flexwidth-08{flex-grow:0.8;}
.nt-flexwidth-09{flex-grow:0.9;}
.nt-flexwidth-1{flex-grow:1;}
.nt-flexwidth-2{flex-grow:2;}
.nt-flexwidth-3{flex-grow:3;}
.nt-flexwidth-4{flex-grow:4;}
.nt-flexwidth-5{flex-grow:5;}
.nt-flexwidth-6{flex-grow:6;}
.nt-flexwidth-7{flex-grow:7;}
.nt-flexwidth-8{flex-grow:8;}
.nt-flexwidth-9{flex-grow:9;}
.nt-flexwidth-10{flex-grow:10;}