From the SECTIONS section in management mode, you can edit the list of students enrolled in a section by locating that section, with the help of the search box, clicking the three vertical dost on its line, and selecting "Edit students".

You will get a dialog showing you two lists: Enrolled students on the left, and available students on the right.

The search field allows you to search students by name, email, or their unique identifier. You enroll a student by clicking the "+" button on their line and remove a student from the section by clicking the delete icon on their line on the left.

If two sections have the same list of enrolled students, you can quickly add them to the second one via the "Add students from other section" button at the bottom. You then search for the first section, select it and press "Add".

You can also edit a student's enrolled sections from the STUDENTS section.