Select Duden spell-check styles

Select Edit > Preferences > Dictionary (Windows) or InDesign > Preferences > Dictionary (macOS).

Select your target German language from the Language drop-down menu.

Verify that Duden appears in the Spelling drop-down menu.

Select your preferred spelling standard from the Spelling style options:

• Duden: Accepts only the spelling recommended by Duden. All variants are flagged as errors.
• Duden: Conservative: Accepts only traditional spellings, such as Delphin instead of Delfin, and Graphik instead of Grafik.
• Duden: Press Agencies: Follows Duden recommendations using spelling rules agreed upon by major press agencies and publishers.
• Duden: Tolerant: Accepts all valid spelling variants, such as both Graphik and Grafik, or Delphin and Delfin.

Select OK.