I can not get the composer window to resize, I checked my settings and I also can drag the window out, nor will making it 16:9 make it any bigger. If someone can help me that would be great

The size of your composer monitor will be limited to the smallest monitor on your system. If you can make the window smaller, but not larger, this may be your problems. Some users have found workarounds like booting with only one monitor connected and saving the size or moving the Desktop monitor menus to the S/R monitor and resizing then. Do a search and you'll find a lot of discussion about this.

Im not even able to make it smaller, I cant close the composer window either, which is weird, it was working fine yesterday, but today It is really small.

Try trashing your MCState files (there are two) and your Site settings file.