Unfortunately, using a splitter can come with some issues. An HDMI splitter can’t extend the display to two monitors. What a splitter does is mirror the original image to 2 or more displays. A USB-to-HDMI adapter may effectively add a second HDMI port, which will extend the display.
Does an HDMI splitter extend screens?
HDMI Splitter This lets you expand your single HDMI port to two external displays. No power input is required. Just plug the single USB end into your computer’s HDMI port, and plug each of your two monitors into each of the two HDMI ports at the other end of the adapter.
Can I use a double HDMI splitter for 2 monitors?
Unfortunately, you cannot use an HDMI splitter for a dual monitor. If you plug an HDMI splitter into a dual monitor, you will only duplicate the original monitor’s content. HDMI splitters are designed to send audio and video from a single screen to other screens. It cannot handle data from dual monitors.