Hey, thislittlelog! Thanks for trying NAW. I'm sorry that you had this issue.
A possible workaround is, if your keyboard has it, you can use the num keys + and - to resize the window. Otherwise the only fix for now will be to delete the preferences file, probably located somewhere like "C:\Users\Windows 10\AppData\Local\NESAssetsWorkshop"
Can you tell me what desktop resolution you're using?
Thanks in advance,
Nesrocks