For branches which are created from master, in the report we are not seeing overall code report. Only we can see new code report.
In SonarQube - we can see overall code report and new code report. Same thing needed in SonarCloud.
When you say branches which are created from master, do you mean short or long lived branches? Also, are you using the beta UI?
For long lived branches we show the information on the overall coverage. On the new UI, on the main branch summary page, you can find two tabs below the quality gate for new code and overall code. https://sonarcloud.io/summary/new_code?id=simgrid_simgrid
For short lived branches, we treat them like pull requests and do not show overall coverage because they are considered new code which will be merged with the code.
But how do I improve my test coverage on the existing code in this case?