CRM > Configurations > CRM > Rule-based Assignments

Odoo 15 offers Rule-based assignment features that can be used to automatically assign leads to Salespersons based on rules.

It helps to assign leads periodically based on rules. You can manage assignment rules in a two-way. Manual assignments allow triggering assignments from the team using an action button whereas automatic configure a cron running repeatedly assigns all the team.

As you can see in the below images:

CRM > Sales Tab > My Activities > Opportunity View 

In Odoo 15, you can view similar leads with a smart button on the opportunity page view that helps to identify the total number of similar leads.