data-help="Type on the page. Tap where the text should begin, or drag open a rectangle: a red box, white inside, in which the text wraps and which grows downward as you type. Tap your own text to change it; rest the pen on it to move it, or near a corner of a box to resize it.">Text</button>
data-help="Hide part of the page for everyone: drag open a rectangle, and what lies under it is covered in white, marked by blue corners. Rest the pen on it to move it, or near a corner to resize it; a tap of the eraser removes it.">Hide</button>
data-help="Erase your own strokes and text by moving over them. A tap on an image, or on a Hide rectangle, removes it, if you are the host or a co-host (or added the image yourself). Two quick taps on empty paper, away from anything the eraser would remove, undo your latest mark; again, and the one before.">Eraser</button>
</div>
<buttonid="undo"type="button"disabled
data-help="Take back your latest mark: a stroke, an erasure, a text block typed or moved, a Hide rectangle. Again for the one before. Also Ctrl+Z (Command+Z on a Mac), or two quick taps of the eraser on empty paper. Only your own marks, and only on this page since you opened it.">Undo</button>
</div>
<divclass="group page_view"aria-label="Page and view">
data-help="Show the whole page in the window. Pressed by the host, it does so on every screen. Ctrl (Command on a Mac) with the scroll wheel, or with a pen stroke up or down, zooms about the pointer.">Fit</button>
<buttonid="zoom_sheet"type="button"
data-help="Show the page at the scale a new page has: one A4 sheet filling the window. A shrunk page is then seen at its size on the sheet. Pressed by the host, it does so on every screen.">A4</button>
<buttonid="zoom_widen"type="button"hidden
data-help="Make the page wider, for everyone, until it fills the window at this zoom. Nothing on it moves.">Widen</button>
<buttonid="zoom_shrink"type="button"hidden
data-help="Make the page, for everyone, just large enough for what is on it, with the margin around. Nothing on it moves.">Shrink</button>
<labelclass="toggle"data-help="Let the page grow when your writing reaches an edge. Off, your writing stops at the edge. Images always get the room they need.">
data-help="Put an image file, such as a scanned exercise, on the page for everyone: below the images already there, centred, at its own size. Rest the pen on an image to move it, or near a corner to scale it; it comes to the front. A tap of the eraser on an image removes it; writing on it stays.">Image</button>
data-help="Start a new page for everyone from a page kept in a notebook, with everything on it. The current page is kept in each notebook.">Notebook</button>