Options/Open new tabs next to the current one

Explorer++

Tools/Options.../Open new tabs next to the current one

System Default:   No

New tabs on the Tab bar are normally created/opened at the extreme right  position.  This option, when checked, forces new tabs to be created to the immediate right of the active tab.  This position for the tab is used even if the tab is created by a non-active tab elsewhere on the Tab bar using the Context menu, for example.