Wow! Thank you for the above Gladonel, this worked for me and I've been trying to fix for month's now (waited for years for Origin to update to a new client interface and still have/had scaling problems with the new update).
I have had Origin for years now, and have been using a 4k TV as my monitor for at least the last 2 years and it is disappointing to see that they still can't get their gaming client right. Steam has constant updates, which is sometimes an inconvenience, but has a very smooth and much superior interface.
EA, your quality control with regards to your Origin client is lackluster. 4k monitors are not a niche, they will and are becoming the future of gaming. Applications that don't scale properly with high resolution monitors are unacceptable, especially from such a giant company.