The Autonumber feature in Dataverse Toolbelt assists with configuring the platforms native autonumbering feature and supports

1. configuring string columns with new autonumber configurations
2. modifying the configuration of existing autonumber columns
3. updating the seed (current position) of an autonumber column

To view and configure autonumbers for a specific table, search and select the desired table from the autocomplete dropdown

TO configure a new column as an autonumber select Configure New, otherwise to update an existing column click Reconfigure Selected

 See Microsoft documentation linked below for Autonumbering options
https://learn.microsoft.com/en-us/dynamics365/customerengagement/on-premises/developer/create-auto-number-attributes?WT.mc_id=DX-MVP-5004940&view=op-9-1#autonumberformat-options