A mattress overlay provided a good temporary backdrop for video conferencing. However this was cumbersome to set up, so I now have a freestanding woven rattan screen. This is 1700 mm high with four folding panels each 400 wide (making 1600 mm total).
The screen is light and easy to move, being able to be folded and put in a corner when not needed. The one I chose is woven rattan in natural finish. These are available with fewer or more panels, but four seems about right.