When using a stylus with PDF-Xchange, here are some settings that can really help to maximise the screen space while also reducing the chances of accidentally touching the wrong things, and also means you can use your fingers to scroll and pan, while using the pen to also write.
Then change the toolbar to have all the tools that you normally need, something like this:
NOTE: You can download the settings file below to do the same thing.
This also includes the extra button that allows you to turn the scrollbars on and off, as shown in this forum post: https://forum.pdf-xchange.com/viewtopic.php?t=43756 :