Add preview controls to resize the sketch canvas #3768
Description
Increasing Access
Currently, changing canvas size requires editing createCanvas() and restarting the sketch.
For quick visual iteration, this can feel slow especially for beginners and students.
Preview-level controls provide immediate feedback and make experimentation easier.
Feature request details
I’m proposing a small UI improvement to the Preview panel that adds + / − buttons to resize the sketch canvas while it is running.
What the feature does
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Adds resize controls in the Preview header
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Resizes the active canvas live using resizeCanvas()
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Does not reload the sketch
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Does not modify user code
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Resize is temporary and resets on re-run
Limitations
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Resizes width and height equally
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Applies to the active sketch canvas
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Desktop preview only for now
I’d love feedback on whether this interaction fits the editor UX and whether resizing should remain temporary or persist across runs before opening a PR.