When the C icon appears, in the full screen, swipe left/right to move the selected
line.
Click the direction buttons of the C icon to fine-turn, long-press to move
continuously. Click the center "ab" button to select a, b, or a&b.
Control the vertical
cursor line
3.Junior User Guidebook
Switch horizontal or vertical lines
If vertical lines are selected, drag up and down.
Switch to select the lines
23
Cursor line
Selected Unselected