Not resolving new dependencies problem
Adding a project depdency to
build.sbt should work straightforward. But rarely, new dependencies do not get resolved spontaneously.
In IntelliJ project window, switch the preselection (top left corner) to "Project" (not Project Files, not Packages or other). In "Project" inspect the resoved dependencies under the node called "External Libraries". If the external libraries do not update even when "Reload all BSP Projects" (BSP tool window), then following work-around could help: in IntelliJ create a new Project, e.g. sbt 1.5.5, scala 2.13.6, from scratch. Build it. Close it and return to the previous project. Rebuild.