You can select a group…

an open source PCB editor for Microsoft Windows, released under the GNU General Public License.

You can select a group…

…of contiguous segments that are in the same layer with the selected segment in order to then change their width, for example. When the segment is highlighted, press F7_Select_in_Layer.

You can select…

…all the segments of the trace that are between the two selected segments. Highlight the two segments by holding down the CONTROL button, and then press F6_Select_Between.

Select between

But if two parallel segments were selected, then first the function will look for parallel segments between selected segments.

Free PCB design program for Microsoft Windows

Press F6 again to get the result.

group selection