The ShowCanvas command displays a canvas where math and text are laid out in columns inside scriptable components.  

A "canvas" is an interactive section of a Maple document created by the NewCanvas command, or a shared web-based Maple Learn document.   See the Script command for a more complete description.

$\mathrm{with}\left(\mathrm{DocumentTools}:-\mathrm{Canvas}\right)\:$

$\mathrm{cv}≔\mathrm{NewCanvas}\left(\left[\left[''Title''\right]\,\left[''Column\; 1''\,''Column\; 2''\right]\,\left[\sin \left(x\right)\,x+y^2\right]\right]\right)\:$

$\mathrm{ShowCanvas}\left(\mathrm{cv}\right)$

The DocumentTools[Canvas][ShowCanvas] command was introduced in Maple 2021.

For more information on Maple 2021 changes, see Updates in Maple 2021.