how to i change a smooth mesh to poly

hi guys how do i change a smooth mesh to poly?
cause a mesh is inside my poly and i don’t know what did i do.

see a smooth mesh inside my polygon lines how do i change back to normal?
i cant ctrl-z cause it doesnt allow please help!

You added a subdivision surface modifier

So how do I fix it?

Looks like you may have accidentally hit ctrl+5 or 6! You can go to the modifiers panel and click on the x to delete the modifier and restore your original mesh. You could also try to switch to object mode and then ctrl-Z undo. Ifthis does not work you might want to see if your global undo is unchecked in your prefs! (Blender has 2 undo tracks - Global(object level) and edit (mesh level))