Please confirm if it resolves your issue.
You can do that by going to the Prepare Form app. Double click on the field when inside Prepare Form and click on the Appearance tab on the dialog. You can change font name, font size and font colour from there.
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Are you getting some error? Or is it that drag-and-drop stopped working?
Also, are you facing the same issue when using Organise Pages app as well as via Page Thumbnail from the Left Hand Pane?
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Could you share more details on the issue you are facing? Exact steps would be helpful.
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Click Help -> Check for Updates...
Install the update and relaunch Reader.
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For that to work, you will need the original font file. To install the font:
On Windows: https://support.microsoft.com/en-us/help/314960/how-to-install-or-remove-a-font-in-windows
On Mac: https://support.apple.com/en-in/HT201749
After installing the font, relaunch Acrobat. You should be able to use the installed font in Acrobat after relaunch.
For editing to work, the font referenced must be present on the system.