I wanted to use the helm-org-in-buffer-headings function. Yet for some reason helm-org layer is missing. If I install it manually via package list packages it gets deleted with the next start of spacemacs.
How could I get helm-org to work? Maybe I should completely reinstall helm? If I put helm in configuration layers unfortunately helm-org doesn't install.
The helm besides the helm-org seems to work fine.
If helm-org is not part of the helm layer, you can add it to your personal configuration manually. Add the package name to the dotspacemacs-additional-packages list in your .spacemacs file. If you find a nice way to configure it, consider learning a bit about how Spacemacs layers work and add the package to the existing helm layer configuration ;)
Spacemacs is configured to delete any package that does not belong to a layer and isn't in this list. I was confused by this at first too, but now I consider it a nice feature. It allows you to install and audit a package and then have it cleanly removed if you don't like it and want it around anymore.