i cant find portal structure

its not in my admin panal.the onley portal thing is configuration.please help me.

Hello.

Have you clicked on the little yellow arrow at the bottom of your menu, on the left hand side of your admin panel ?

no. its just not there at all.even configuratin isn't shown on the panal.only in the home.but preiview, and struckture are gone.

You must click on this yellow arrow at the bottom, to have them shown.

I indicate it with red on this screenshot :

i always do that. its still not there.