Depending on your model, some models allow oversized desktop but everything starts looking like tunnel, as you need to pan around. Oversized destops might not let some oversized desktop sensitive applications to open.
Some oversized resolution of a FHD display might me 1152p or 1440p, but setting these resolutions might show the entire screen, depending on your model, whether it has 'auxiliary' pixels, make a tunnel, lower the color depth, show blurry letters, or even turn black and go dead in the worst cases of very oversized desktop sensitive destop monitors.
I suggest not trying this unless you know that is is true non oversized desktop sensitive monitors or true very oversized destop sensitive monitors. All monitors have the option to hide modes that monitor can't display properly or not. In that case, when monitor can't display properly, it is the GPU to show the picture which might look poor, depending on how sensitive your monitor is to oversized desktop.
In that case, you must call the computer model maker to see if it's sensitive to oversized destop or not.