Screen flickers while writing in a PDF on Windows 10 touchscreen devices

On Windows 10 touchscreen devices, screen flickers while writing or using a freeform Comment tool in a PDF.
 

The registry fix suggested below does the following: In Adobe Acrobat Pro, under Computer\HKEY_CURRENT_USER\Software\Adobe\Adobe Acrobat\<TRACK>\AVGeneral, it adds a DWORD named bDirectInkingEnabled and sets its value to 0. (Here, the <TRACK> can be DC or 2017.)