Cannot render in ultra wide settings with Elements

Hi all,

I'm trying to render an ultrawide 3440 x 1440 (21x9) video to upload to youtube but elements doesn't seem to have an option to do so or am i missing something?

On video settings the aspect ratio seems to be locked, and when finalizing my project and selecting custom render settings, i select the aspect ratio I want 3440 x 1440, however this leaves black bars all around my video

thank you for your help!