QB Issue Resolution:

Unquestionably, the dumbest move they’ve made so far. What’are they thinking!

For now, running balance is not completely gone, just an option. Click “middle gear” far right and select “running balance” column. That will add back to the column.

Resolution for Issue 'Changing the Running Balance Setting Back On' available: Yes (Solved).
Source: Intuit Community forum.

Changing the Running Balance Setting Back On: 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 Back On
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Error Recovery for Back On [Canada]
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