Sorry too dumb for that.
In Editor in Tool Options in the Task Bar at the bottom left of the
screen it should have Brush (with icons), size, Opacity, mode. But
what appears for me is 1:1, Fit Screen, Fill Screen, Print size and a
check box for scroll all windows.
Hopefully that makes sense.
Look at the toolbox to see which tool is active. The tool options change for each tool. What you're describing sounds like the zoom or hand tool options. Click the brush to make it the active tool.
EDIT Look in your photo. Is the tool cursor a litle hand? If so, you're stuck on the hand tool. The spacebar is the shortcut to activate the hand tool. Just give it a whack to get back to your regular tool.
What you see in the tool options has everything to do with the toolbox. The tool options change to reflect the settings available for the selected tool and to show you the other tools that share that toolbox slot if there are nested tools. Every time you change tools your tool options change, too.