At the moment, there isn't a way to sort specific columns in the register view.
However, by default, forms are ordered by the Creation Date (the most recently completed form, sitting on top).
They can also be sorted by using the Sort Forms By setting on the template, allowing you to order the forms by any date field you have set on your template.
Alternatively, you could use the filters/search bar to whittle down the data & help find what you're looking for. Another method would be to export your register as a CSV file, open it in Excel and sort the relevant columns to find the data you're looking for.