You can select multiple styles at once and then move, duplicate, or remove them.
To multi-select styles:
As you hover the cursor over a style, a checkbox is displayed.
Click the checkbox to select a style. Now all the styles display a checkbox available for selection.
Click the styles you want to select.
Select the action you want to do with the selected styles by going to the top right of the page and clicking the appropriate icon:
Move the selected styles to a section
Duplicate the selected styles
Remove the selected styles