QB Issue Resolution:

it is an on or off thing.  You would customize your settings in the gear wheel section.

As Emily stated above, you can customize your reports, remove the # column and then save the customization.

Resolution for Issue 'Can I remove the account numbers from the chart of account items just when displaying reports?' available: Yes (Solved).
Source: Intuit Community forum.

Can I remove the account numbers from the chart of account items just when displaying reports?: 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 account items
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