Yes, you can. Go into the Gear icon, Customize Forms , Edit and Header. There you can change Estimate to Quote.
Resolution for 'change Estimate issue: 'Can I change an “Estimate” to show as a “Quote”?' available: Yes.
The change Estimate 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 change Estimate issue yourself by looking for a resolution described in the article. If it is a complex change Estimate issue or you are unable to solve the issue, you may contact us by clicking here or by using other change Estimate support options.
For more information about resolving issues related to change Estimate in Quickbooks/QBO or to get support for the issue 'Can I change an “Estimate” to show as a “Quote”?', click the link below: