Hello,
Depends what you have searched for.
Each Manjaro ISO comes with a DE specific package. For XFCE is called manjaro-xfce-settings that will place in /etc/skel/ all the files needed during user creation to have the Manjaro specific settings.
Since you kept /home/youruser as it was, now you have to copy those files manually, from terminal:
cp -a /etc/skel/* ~
or
cp -a /etc/skel/* /home/yourname/
Please DO NOT use sudo ! If you have troubles with the terminal command, you can use the File Manager.
Once copied, log out and back in.