There is lots of space everywhere, could the addon somewho get smaller, look at the any.do or the RTM addon for size comparancy
Your using our Chrome extension? Then the size of this depends on your screen resolution and what Zoom level you have it at. Can you send a screenshot of it to firstname.lastname@example.org and email@example.com so we can confirm.
My zoomlevel is 100 %, screensize 1680x1050.
I have sent an screendump by email
Based on your screenshot it appears you have Chrome in a Window mode, and this will of course make Todoist appear over most of your Window. There is no way to change the size of the Todoist panel at this time. Though it is based on your resolution, so if you have a higher resolution, it will be smaller.