I did a few tests with the deployment example ocis-wopi.
It would be cool if only OnlyOffice was used, I find it confusing that both Office packages are started and used in the interface.
My first attempt was to comment out the containers ocis-appprovider-collabora and ocis-collabora in the docker-compose.yml file.
Unfortunately, no Office package is then displayed in oCIS.
I have not found anything in the wopi configurations.
I only changed the OpenOffice formats to OnlyOffice in the app-registry.yaml file of the ocis configuration.
I have also commented out the accesses to the Collabora URL in csp.yaml.
Unfortunately, OnlyOffice did not work in the web interface either.
Any ideas?