In Salesforce, Agents can click the Transfer icon to transfer the Chat. Check the following screenshot for reference.

Agent Screen:

Visitor Screen:

Disable Chat Transfer in Salesforce Lightning Omni-Channel:
In Salesforce, Agents can click the Transfer icon to transfer the Chat. Check the following screenshot for reference.

Agent Screen:

Visitor Screen:

Disable Chat Transfer in Salesforce Lightning Omni-Channel: