Hi Michael,
There is not a way to selectively disable the Late grade deduction policy for specific assignments. It's an all-or-nothing setting in the new Gradebook. Also, changing the policy partway through the semester will affect previous grades as well as new ones.
The only workarounds I can really see are 1) change or get rid of the due date setting for the assignments that should not be penalized for being late, since Canvas determines whether something is "Late" based on that, or 2) manually change the status for each late submission in the Grade Detail tray, either to "None" (that is, not late, missing, or excused), or the "Days Late" to "0" if you still want it to show as late but not be penalized. Note that this would have to be done fort each individual submission.
Mike
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