In MOODLE 1.9, hiding an asssignment on the course page, did not hide the assignment in the gradebook. To hide it there, the teacher needed to go to the Categories and Items view and explicitly hide it in the gradebook.
In MOODLE 2.3, hiding the assignment on the course page, hides it in the gradebook and the teacher needs to explicitly unhide it there.
I don't know what you mean by "simple view" but you can unhide the assignment in the gradebook/user report as follows.
- Click Settings
- Click Grades
- Click Categories and Items tab
- Click the "eye icon" next to the hidden assignment name to open the "eye" and make the assignment visible in the user report.
This is what our teachers do when they hide assignments on their course pages but want them visible on the user report. It works well although they are unhappy about the extra work it creates for them. I don't know why the functionality was changed in 2.3 in this regard.
There are times you want to hide assignments in the user report so I do not recommend changing permissions to accomplish what you want to do.
I hope this helps.