Without "excluding" folders, how can I stop Indexing intellij idea on start? It's very very annoying that it starts indexing on startup without allowing you to, for example, debug a test case making you wait until indexing has finished.
You can stop synchronizing/indexing each time you switch to the IDEA and it's quite useful when dealing with big projects and outside build process which triggers indexing.
Just disable checkbox System Settings -> Synchronize files on frame or editor tab activation
.
Make sure you run indexing manually to update hints when needed through Synchronize
menu (Cmd-Alt-Y on Mac) or File -> Reload All from Disk
to run it manually for IDEA 2020 running under Linux