Youtube videos, webpages, and other layouts look weird with native portrait display.

Installed a raspberry pi4 with pisignage on it. It's plugged into a Novastar VX400, the video walls native resolutions is 1080x1920. The problem is that pisignage is interpreting the video wall as landscape, while in reality it is portrait. This cause vertical content on webpages to appear in the mobile view and stuff like youtube to throw black bars on the left and right creating a squished video. Any help on this would be great. Thanks!