This issue occurs when you have a single lambda argument with a single statement multi-line body. Scalafmt will drop the lambda to a newline and indent the block. Please correct me if this is working as intended or if a configuration already exists.

With default configuration,

// Before scalafmt (and expected output)
foos.map(foo =>
  foo
    .withBar("bar")
    .toString)

// After scalafmt
foos.map(
  foo =>
    foo
      .withBar("bar")
      .toString)

Meanwhile these similar scenarios are unchanged as expected:

foos.map(foo => {
  // ...
})

foos.map { foo =>
  // ...
}

P.S. for our style guide, I would actually prefer a rewrite rule to add curly braces around multiline lambda bodies:

// Before 
foos.map(foo =>
  foo
    .withBar("bar")
    .toString)

// After hypothetical rewrite rule
foos.map(foo => {
  foo
    .withBar("bar")
    .toString
})

Do you think this is doable/worthwhile? I'm always happy to contribute if you think it is a good addition.