[2022] how to select a diffrent Specialization (accidently picked one)

hi

i was checking al " Specialization " info and by accident i hit F and was chosen Demolitionist. which i didnt want to start with...

and i bought the DLC warlords yesterday. so for 2nd character i guess ill have a free choice

Q = how do i select/switch a specialization to one that i DO want.?