Change the direction of the merge line of a quadface

[zhuanghansheng]

How to change the direction of the merge line of a quadface, I remember there should be a pulgin for doing something like this, what is that?

[Box]

If you mean the diagonal, use the triangulation flipping tool from Quad Face Tools.

[Forestr]

You can use the “flip edge” tool in the Sandbox toolset too.

https://extensions.sketchup.com/en/content/sandbox-tools