Beta 11: Duplicate Accounts on PC (eMSynch)

I enabled emSynch in the Android 11 beta app. In this app, I changed the names of the email accounts (e.g., Am1, Am2).
After installing it (as an update via an MSI file) on my PC (with emSynch also enabled), I now have duplicate email accounts. One appears under the “real Gmail name” ([email protected]) and one under the name I used on my phone (AM1, etc.). How can I “remove” the duplicate accounts (or emails) without deleting the emails?