My problem solved but leaving this thread here in case someone in the same situation encounters the same question.
In short, if you do your undergrad in Canada, get admitted into grad school, use the offer to extend your a study permit in Canada, (due to various reasons esp the pandemic) do not take any class with it, leave Canada, return to your own country, change to another school, and plan to return Canada, then you will need a NEW STUDY PERMIT INSTEAD OF just using the old study permit you have to apply for an ENTRY VISA.
(I think I am the only one who did all the above step by step during the pandemic)
In short, if you do your undergrad in Canada, get admitted into grad school, use the offer to extend your a study permit in Canada, (due to various reasons esp the pandemic) do not take any class with it, leave Canada, return to your own country, change to another school, and plan to return Canada, then you will need a NEW STUDY PERMIT INSTEAD OF just using the old study permit you have to apply for an ENTRY VISA.
(I think I am the only one who did all the above step by step during the pandemic)
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