Thank you, good to know this approach.
For my current use case, I solved this with a workaround which requires less work than converting all pages to another canvas.
I am sure I did not import from PDF. I am not sure how I could measure if I imported Gravit Designer file. I did open the file from gravit cloud, maybe that counts as import?
Anyway, in gravit designer web, while not in Multipage mode, I can add multiple pages (at least twenty) without importing or opening any file. Is this behavior intended?