QB Issue Resolution:

The “X”sign normally shows up if the account is not active. However, if it’s active, you can remove it by clicking the “X” sign before the account name. If the sign still showing in the chart of accounts page,  you can check this article on how to run verify data and rebuild company file: http://payroll.intuit.com/support/kb/1000464.html.

Resolution for Issue 'What does “X” in front of chart of account categories mean? These are not HIDDEN / inactive.' available: Yes (Solved).
Source: Intuit Community forum.

What does “X” in front of chart of account categories mean? These are not HIDDEN / inactive.: 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 accounts page
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