Hello,
The determination to accept tokens as query parameter is determined on the resource server in the "OTK Require OAuth 2.0 Token Properties" assertion in the API by setting the "Disallow retrieving access_token from query string" property to True.

In OTK 4.6 you can also enable FAPI baseline which disables globally the use of query parameter for AT but this will also enforces all of the FAPI baseline restrictions as well.
https://techdocs.broadcom.com/us/en/ca-enterprise-software/layer7-api-management/api-management-oauth-toolkit/4-6/fapi-compliance.html