Epson FX-2190 Reference Manual page 188

2. Pull the lock levers on the edge guides forward to release
them.
3. Slide the left paper guide until it is aligned with the triangle
mark; then lock it in place by pushing back its lock lever. Next,
slide the right paper guide to roughly match the width of your
paper. Slide the paper support to midway between the paper
guides.
182 Options and Consumables