RE: Preview report in Report Builder or Visual Studio
Hi,
I don't think this is possible at the moment.
You need to publish the report to BC (a sandbox for example) to be able to run it.
The same is true for al other AL-development, to see any reqults, you need to publish your app to a sandbox and run it on there. This can for example be a Saas sandbox, or a docker environment or an onprem environment.