You may also install rubocop and syntax_tree for enhanced support. (I believe, but am not certain, that they need to be installed within your project rather than globally.)
Settings
Formatter
The formatter to use with pulsar-code-format (or atom-ide-code-format). Default is auto, but consider installing the syntax_tree gem and setting this value to syntax_tree, since that’s apparently the only formatter that can format arbitrary ranges.
Linters
The set of linters to use. This maps directly to a ruby-lsp setting. If you’ve got Rubocop set up in your project, add either rubocop (for Rubocop’s built-in ruby-lsp add-on) or rubocop_internal (for ruby-lsp’s own Rubocop adapter). The linter will respect a .rubocop.yml if one is present in the package root.