Implement better scaling of main table showing entries

[koppor]

Preserving JabRef#7181.

### Compulsory checks
- [ ] Change in `CHANGELOG.md` described in a way that is understandable for the average user (if applicable)
- [ ] Tests created for changes (if applicable)
- [ ] Manually tested changed features in running JabRef (always required)
- [ ] Screenshots added in PR description (for UI changes)
- [ ] [Checked developer's documentation](https://devdocs.jabref.org/): Is the information available and up to date? If not, I outlined it in this pull request.
- [ ] [Checked documentation](https://docs.jabref.org/): Is the information available and up to date? If not, I created an issue at <https://github.com/JabRef/user-documentation/issues> or, even better, I submitted a pull request to the documentation repository.