Windows update on 1/2/19 - second monitor now not detected or multiple monitors unable to select.

My 2 mos old Acer had a Windows update last night. I have an additional monitor (Asus) attached for larger format to do paintings. Today the monitor stopped working and the multiple drop down box under display is gone. I have tried everything. Help!

from Windows Central Forums http://bit.ly/2H2AWHE
via IFTTT