I don’t believe it can be done by Notepad++ itself.

If by “next to” you mean “to the right of”, then the following PythonScript script can do it:

# -*- coding: utf-8 -*-

from Npp import *

curr_view = notepad.getCurrentView()
total_tabs_in_view = 0
for (pathname, buffer_id, index, view) in notepad.getFiles():
    if view == curr_view: total_tabs_in_view += 1
curr_tab_index = notepad.getCurrentDocIndex(curr_view)
notepad.new()
for __ in range(total_tabs_in_view - curr_tab_index - 1):
    notepad.menuCommand(MENUCOMMAND.VIEW_TAB_MOVEBACKWARD)