In the original context of a paper scroll, it is 捲上 or 捲高 (scroll up) and 捲落 or 捲低 (scroll down).
In the context of a computer screen, you can also say 移上/移高 and 移落/移低, or you can say 轆. I'm not aware of any standardized lingo. But I wouldn't be surprised if some professional organisation already has a preference on how to say this. I would just use anything that makes sense to you.
In the context of a computer screen, you can also say 移上/移高 and 移落/移低, or you can say 轆. I'm not aware of any standardized lingo. But I wouldn't be surprised if some professional organisation already has a preference on how to say this. I would just use anything that makes sense to you.