Hello, I noticed:
on the iPad in Engrave Mode we have an area for Vertical Adjustments (of staves) and an area for Horizontal Adjustments (for bar lines, notes etc.).
Vertical adjustments can be done on the iPad touch interface with finger or Pencil.
Horizontal adjustments can’t.
Indeed, just as on the desktop version, where you cannot make horizontal adjustments with the mouse, you need a keyboard to make note spacing adjustments both on the desktop and in the iPad version.