QB Issue Resolution:

Yes, stop changing the bank account in the upper left corner to Undeposited Funds. This account in the upper left should be the account you are depositing IN to. Change this to your bank account and you should see the list of undeposited funds appear at the top of the deposit screen.

If this is a file converted from desktop, then you probably have to Undeposited Funds account, you have to use the QBO generated one. Merge them or else move the payments to the correct one & turn off the other

Resolution for Issue 'Deposits not showing undeposited funds' available: Yes (Solved).
Source: Intuit Community forum.

Deposits not showing undeposited funds: 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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