Cannot remove printer for a RE-Setup from HP Smart App

[BKLUR]

I have HP Smart App and used it for my home printer Envy series for a while. Recently I have setup a NEW printer HP Smart Tank 750 in my office that is where the problem start. 

I have setup and add Smart Tank 750 as my new printer in same HP Smart App in my Windows laptop. However, during the initial setup, I use the USB plugged in, and successfully installed and print/scan from Windows.  I later setup Wireless manually and it seems successfully setup.  However, I cannot print to use Wirelessly - both are connected to the same WIFI, I can print, but nothing output.  This is where I tried to delete the printer in HP Smart App and setup WITHOUT USB (which was the default that I did not choose in initial setup).

However, I don't see anyway to DELETE the HP Smart Tank 750 printer setup (which indicate it is a USB connection).  If I unplugged the USB, and try to let HP smart app detect it wirelessly - but the app still  find the unconnected USB printer setup and hence NO NEW PRINTER is detected.  I wish to be able to do all mode of printing, using WIFI, or WIFI direct, or USB connection but unable to resetup.  

Anyone could advise how to setup it up given I started with USB first, and/or how do I delete the printer already setup so that I can restart again?  I have removed printer from Windows control panel and restarted the laptop but HP Smart App setup still persist.  

[BKLUR]

Just to add that I seem a few post to "select a different printer" and "remove the link" it does not have this on the Windows HP Smart App.