You can choose a set of templates saved in your sandbox space by using an appropriate sandbox prefix. For example, if you want to preview a version of แม่แบบ:Test that you have saved as "ผู้ใช้:Foo/ทดลองเขียน/แม่แบบ:Test", use "ผู้ใช้:Foo/ทดลองเขียน" as the prefix.