Cannot find dragging lines I dont know how I got this one. I cannot get the property panel. I dont see any short cut keys like T &amp; N for the third panel? I don't also see the three lines in the corner to split the screen. There are only three dots that only moves up and down.
Please help me with this. Thanks.
Looks like you have maximized your 3D view.

You can toggle this action with the shortcut keys  CTRL + Up Arrow  or with SHFT + Spacebar

Or find the option in the View menu