Same situation here. During the COVID-19 lockdown, we have introduced weekly quizzes to keep track of student engagement, so some semester-long shells have up to 15 extra columns. I have also had to add an ungraded column to separate students into their two class groups, and there is a departmental unit review quiz that asks students about their online experiences, the teacher's knowledge and speed of feedback, etc. None of these are assignments per se, and they clutter the critical area which is obviously the resulting. Yes, you can reduce the column widths - up to a point - but it still looks messy and I've already had colleagues mistakenly pass students when they have misinterpreted one of these extra columns as a part of the assessment requirements, then missed the fact that the student didn't submit all the assessments themselves!
Over the years, we have migrated from WebCT and Blackboard, both of which had the option to hide columns. This feature should also be in Canvas ... and sooner rather than later.
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