Victor,
I have seen some way to adjust the location of the screen but I have not had the chance to play with it.
The position of the preview window can be adjusted for slides. You can choose to have it centered with regards to your tap or optimized for right or left hand use in order to avoid that your hand covers the preview.
For expansions, the preview window is always centered with regards to your tap.
How does one create a *.glo Glossary file
To create a brand new glossary, create an empty file with a .glo extension in the
My Documents/Fitaly/Glossaries folder. Then load it by tapping the "i" info key on the side bar, then on Load Glossary... and select the newly created glossary file.