Because a few generators will break if the matrix only has 1px in a direction, the minimum allowed pixel size is 4. But that doesnt really matter, if you want to control a stripe with 100 LEDs you can size the matrix inside Jinx! to 100 x 4 pixel and simply only patch one of those 4 rows to your interface. If you further activate the „Use Patch State for Pixel drawing“ switch inside the Matrix Options, you will only see this single row inside the previews.