QB Issue Resolution:

At this time, there’s no way to remove that entry from the Home screen.

Resolution for Issue 'Activity list on QBO Homepage' available: Yes (Solved).
Source: Intuit Community forum.

Activity list on QBO Homepage: 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 Activity List
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Error Recovery for Activity List [Canada]
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