You change that in settings. Gear>account and settings>advanced.  It is near the bottom.  Default setting is invoices so you have to change the dropdown to change to sales receipts, etc.

Resolution for 'body text issue: 'I would like to change the default body text for Remittance emails.' available: Yes.

The body text issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the body text issue yourself by looking for a resolution described in the article. If it is a complex body text issue or you are unable to solve the issue, you may contact us by clicking here or by using other body text support options.

For more information about resolving issues related to body text in Quickbooks/QBO or to get support for the issue 'I would like to change the default body text for Remittance emails.', click the link below: