You're right, it can be dismissed that way. I looked for a way to disable it completely and quickly found that wasn't possible, but I did discover the right-arrow trick you mentioned. But it doesn't make it disappear for long, and I never managed to build up the reflex of pressing it regularly (it's kind of non-obvious, you have to admit), and to be honest I'd mostly forgotten right-arrow did that. But thank you for reminding me, I may have to try to work on that muscle memory.