QB Issue Resolution:

Presently, this isn’t a feature. You can manually unreconciled each item in the register by removing the “R”.

Resolution for Issue 'Why can’t I adjust a previous bank Rec? In old Quick Books I could Undo/adjust etc Why is there no option to alter in QBO? Should be an option!!!' available: Yes (Solved).
Source: Intuit Community forum.

Why can’t I adjust a previous bank Rec? In old Quick Books I could Undo/adjust etc Why is there no option to alter in QBO? Should be an option!!!: 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 alter in QBO
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Error Recovery for alter in QBO [Canada]
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