Have you considered using the Column Picker?
A quote from the Qlik Sense online documentation:
Column picker
When space is limited and not all dimensions and measures can be displayed in a table, the column picker appears on the right in the table. When you click the column picker, a list is displayed with all dimensions and measures in the table. You can temporarily change the order of the columns by dragging them in the list, and you can make selections in all displayed dimensions, as usual.
