How can I rotate an inclined sketch plane to horizontal?

What BKE is describing this.

Use Align Tool

Use Project Tool to recreate the sketch.

If we could copy and paste angles within the app we wouldn’t need to do this.

We don’t have rotation snap based on main XYZ origin, but the starting rotation point of the model or sketch, that would be a new feature we need.

I usually write down the degree as note somewhere and just type it in manually, yes not very productive.