You must control points of your template using branch geometry. So you need a template that includes main+branch and apply it along the turnout. Main line is usually the reference. Then add a point control to the edge of the ballast (and/or subballast depending on the template behavior) to follow the geometry of the branch. You can also define the branch as a secondary alignment, a quick way to be a little more accurate for the external part of the branch. You can find templates such as "single track - Siding left (or right) in the delivered template library that are made for such design.
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