If you wish to maximise desktop space, you may wish to hide the taskbar when you're not using it. By doing this, the taskbar will only appear as you move your mouse towards wherever it may be docked (usually at the bottom of your screen).
Start by right clicking on an empty space on your taskbar and select Taskbar Settings:
Now toggle one or both of the Automatically hide the taskbar... options, depending on how you wish the taskbar to behave. It may be that you wish to hide it in Desktop mode, but have it appear in tablet mode (or perhaps this doesn't even apply):