Go to Edit > Preferences > Content Editing > Font Options.
When you add text in a PDF, by default Acrobat picks nearby font attributes for the new text. Similarly, when you edit existing text in a PDF and the font is not available on the system, by default the font fall-backs to a specific font in a particular script; for example, font fall-backs to Minion Pro in roman script fonts. This default behavior can lead to fonts with an inconsistent appearance in a PDF document. To make it consistent throughout all the PDFs, instead of using the default settings, you can choose a specific font for both Add Text and the fallback option in edit text features using the Font Options under the Content Editing preferences.
Steps to change the default fallback font for editing text:
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Select an appropriate font in the Fallback font for editing drop-down list.
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Click OK.
Steps to change the default font properties for Add Text:
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Go to Edit > Preferences > Content Editing > Font Options.
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Select an appropriate font in the Default font for Add Text drop-down list.
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Select an appropriate font size in the Font Size drop-down list.
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Click OK.
To restore the default behavior, select Let Acrobat choose in the drop-down list.