Hello!
I've just had a copy of Sketchbook Pro 2021 for work and I really enjoy the new custom curve ruler. It's easy to use and is a powerful tool that could influence the industry.
Unfortunately I've noticed quite a few times that the "straight ruler" often ends up staying visible on screen since this version when I put it away It doesn't happen right away but after a few seconds or minutes of working it seems garanteed to happen eventually. The only way I've figured to get rid of it is to restart the software. Impractical if I have to do it every 2 minutes or so. It doesn't affect drawing but it does clutter up the screen.
Letting you know and hoping for a fix eventually. I've replicated the visual glitch and taken a screenshot provided below (ruler ghost circled in red -oftentimes dotted ruler line still remains).
Cheers,
MD
ruler ghost image