When documents have multiples Initials and Signatures, you have two options, autofill all at once or do one by one; depending on your preferences and workflow, you can choose the option that better works for you.
To make the changes navigate to Business Settings > Signing Preferences > Signers & Recipients "Require signers to complete each signature/initials fields separately" > Save Changes
💡 TIP
The option is available to fill the fields, not to place them.
Fields for signatures and initials must be placed manually one by one on the documents.