there is a glitch When I am trying to assign a new material in a particular face. the face is getting hidden. and I can not get that back. please help me. how can I fix that?
Hello and welcome!
Have you a screen or better a video what is going on to see your actions?
P.S. it’s not a good place to ask for help, here mostly dev and python things. A good place is blenderartists.org and in support branch you can choise category for ask for help.