QB Issue Resolution:

@ vo

if you invite someone who has the accountant version to your company file, they have an undo recon button

other wise yes it is one at a time

Resolution for Issue 'I’m sorry, but to unreconcile a month’s worth of transaction I have to INDIVIDUALLY UNRECONCILE THEM?' available: Yes (Solved).
Source: Intuit Community forum.

I’m sorry, but to unreconcile a month’s worth of transaction I have to INDIVIDUALLY UNRECONCILE THEM?: 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.

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