Details at https://discourse.jabref.org/t/issue-groups-not-visible-in-the-vertical-left-bar-even-if-correctly-visibile-in-the-groups-field-in-each-record/5659/2

Task:

1. Create A.bib with one entry belonging to group "A". Save. Close.
2. Create B.bib with one entry belonging to group "B". Save.
3. Import "A.bib" into "B.bib"
4. Expect: Groups "A" and "B" exist

Fix JabRef to fulfill expectiation.

Documentation:

Fix https://docs.jabref.org/advanced/main-window

1. Link back to https://docs.jabref.org/getting-started for an overview
2. Explain File -> Open vs. File -> Import

After the task is done

• Ask at the forum that the user should test by following https://blog.jabref.org/2025/05/31/run-pr/
• Reply to the user that import is import into current library (meaning adding) while "open" means opning a new file. JabRef can handle multiple libraries