QB Issue Resolution:

To make Estimate (all sales forms) number visible or assign number manually, you will need to change it on company settings.

(Gear > Settings > Sales > Sales form content > Custom transaction numbers > ON)

Resolution for Issue 'my estimate # is not displayed on entry screen ??' available: Yes (Solved).
Source: Intuit Community forum.

my estimate # is not displayed on entry screen ??: this 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 issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for assign number manually
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Error Recovery for assign number manually [Canada]
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