Fun fact: all these smart TVs run Linux, which is supposed to facilitate that, but they're DRM'd to prevent it instead. There are active lawsuits going on about it.

https://sfconservancy.org/copyleft-compliance/vizio.html

Ah, yeah, for that, just factory reset it, don't connect it to the internet on setup and use HDMI.

An alternate less useful answer might be looking up TVs marked as "commercial displays". They are a less consumer marketed display.