Hi Ofi Khan,
i tried to solve the issue, also with the solution you've suggest to Allen but the problem persist.
The issue is present only in the homepage made with SP Page Builder Pro, in all other pages the canvas toggler works as expected.
If I analyze the code with inspectors I see that "event" is present before "flex", on all the other pages where the canvas-toggler works both are visibles.
I sharing with you the url of my site on hidden content.
Thanks
Enrico
system configuration: Joomla! 3.10.1, Helix Ultimate 2.0.1, Sp Page Builder Pro 3.7.13