I have been disappointed with Acrobat Standard DC in touch mode. I could find nothing in your support section that helps me with this. In full screen mode, the highlight tool does not operate. (I can only use it to underline or strike through). Page navigation is tough. I have not found an easy way to get back to regular mode once I am in full screen mode. (I have to close the program and open it again.) It seems to me that given the high cost of the software, Adobe should have developed this feature so that it works efficiently and smoothly and also posted tutorials on its website to assist users in learning how to access touch mode features.