Samsung has finally begun issuing fixes for the Galaxy S20 FE's touchscreen problems via a software update. It is roughly 174MB in size and is currently rolling out in Europe. A global release should follow suit in the coming days.
https://www.notebookcheck.net/Fix-for-Galaxy-S20-FE-touchscreen-issues-now-rolling-out-via-a-software-update.498964.0.html