Can I disable the automatic space after period and comma?

Tobii Communicator is by default set up to automatically add a space whenever a user types a period or comma. If you do not want automatic space, you can disable it in Settings - Word Prediction and then unchecking the box "Add space after period and comma".

If you can't see the menu bar, you need to exit full screen mode by pressing F10 on your keyboard or choosing "Run in Window F10" from the right-click context menu.