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Hi,
On the first screenshot you presented AutoCAD LT for Mac, but on the second - AutoCAD LT for PC.
AutoCAD for Mac has it's own interface and you cannot make it look like AutoCAD for PC.
Looks like you were using 2015 version via Boot camp or inside virtual machine on your Mac.
So if you want the interface of PC version, you need to install AutoCAD for PC on your Mac via Boot camp or in Windows Virtual machine (Parallels Desktop or Vmware Fusion).

Maxim