How to fix face orientation when using screw modifier I'm trying to model a camera lens using vertexes and screw modifier like spline modelling.

But face orientation is fully red and that becomes a problem when I try to use a boolean. Recalculating normals won't work because there are no normals to recalculate.

So are there any ways of solving this without applying screw modifier and then recalculating normals? Thank you in advance.
There are two ways to do this.
Click on the flip checkbox in the modifier settings

Set the angle to -360d