QB Issue Resolution:

Using “batch action,” you moved transactions from “New Transactions” column to “In QuickBooks” column area.

In order to “Undo” transactions, go to “In QuickBooks” column and select items from the list > Batch actions > UNDO

That will bring it back to “new transactions” area again

Resolution for Issue 'I just did a batch action and accidently changed all expenses to the same category. how do i undo that action?' available: Yes (Solved).
Source: Intuit Community forum.

I just did a batch action and accidently changed all expenses to the same category. how do i undo that action?: 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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