OnStyle applies heading styles according to the rules in the active DocConfig. This ensures documents use consistent numbering, fonts, and structure. Available in both Essential and Professional editions . 

Apply a heading style  #

1. Select the text. 
2. On the OnStyle Ribbon, go to the Tools > Headings group. 
3. Choose the appropriate heading level (Heading 1, Heading 2, etc.). 
4. OnStyle applies the heading style defined in the DocConfig, including numbering, font, and spacing. 

Switch Headings #

The Switch Headings tool allows you to convert heading styles between numbered and non-numbered formats across the document or within a selected section.

This ensures consistent heading formatting according to the active DocConfig.

Switch all headings in the document

1. Go to the OnStyle Ribbon.
2. Open Tools > Headings.
3. Select:
   • Switch to Numbered Headings, or
   • Switch to Non-Numbered Headings.

If no text is selected, all headings in the document are updated.

Switch headings in a selected section

1. Select the part of the document you want to modify.
2. Go to Tools > Headings.
3. Choose the desired switch option.

Only headings within the selection are converted.

The available heading style pairs (numbered / non-numbered) are defined in the active DocConfig.

Restore a heading style  #

If a heading was changed manually and no longer matches the DocConfig: 

1. Select the heading text. 
2. In the Tools > Headings group, select the correct heading level again. 
3. OnStyle restores the formatting to the DocConfig standard. 

Validation rules for headings  #

During validation, OnStyle checks headings for compliance. The following inspection modules may appear: 

• Empty Heading – heading text is either empty or contains only whitespace characters 
• Heading Whitespace – whitespace character before or after the heading text 
• Heading Numbering Issue – heading numbering has been changed manually or is missing. 
• Heading Out of Sequence – heading levels are not in logical order. 
• Heading Link Not Set – a heading lacks the required hyperlink. 
• Heading Hyperlink Target Mismatch – the hyperlink text does not match the heading text. 
• Heading or Title with Break – headings or titles contain a page or section break. 
• Standard Style Modified – the standard heading style has been altered. 
• Missing Standard Style – a required standard heading style is missing from the document.