Spelling and grammar checks are enabled by default. These checks are provided by the Grazie plugin, which is bundled with the IDE. To configure proofreading settings, open settings by pressing &shortcut:ShowSettings; and navigate to Editor | Natural Languages | Grammar.

All texts, including comments, textual strings and literals, are inspected against the pre-defined or custom dictionaries. Typos are highlighted so that you can choose the correct word, accept the current spelling, or disable the inspection.

To fix a spelling or grammar error, press &shortcut:ShowIntentionActions; to see the list of available actions.