This is a normal sbt project. You can compile code with sbt compile, run it with sbt run, and sbt console will start a Scala 3 REPL.
sbt to spin up the simple build tool shell. then, run for faster runs (as opposed to sbt run which is basically cold starting the JVM)
For more information on the sbt-dotty plugin, see the scala3-example-project.
Ctrl + J → show/hide bottom panel (terminal, problems, etc.)