QB Issue Resolution:

Yes, it’s very strange they do not have “Void” option available for Bill form.

They do have VOID option for Expense form and Check form.

Only suggestion I have is to change amount to zero, write “VOIDED” as part of memo section and SAVE.

Resolution for Issue 'How do I void a bill in the new, upgraded version of QB Online? When I click on “More” at the bottom of the screen my only choices are Copy, Delete, Transaction Journal, Audit History.' available: Yes (Solved).
Source: Intuit Community forum.

How do I void a bill in the new, upgraded version of QB Online? When I click on “More” at the bottom of the screen my only choices are Copy, Delete, Transaction Journal, Audit History.: 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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