Some settings not remembered

[FM33]

Some settings are not saved across restart of application, like scanner settings, and some settings like number of digits for disc number. Window panels width are not saved neither.
Some settings like default folder are saved.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: easytag 2.4.3-5build3
ProcVersionSignature: Ubuntu 6.8.0-35.35-generic 6.8.4
Uname: Linux 6.8.0-35-generic x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 10 23:15:33 2024
InstallationDate: Installed on 2024-05-18 (23 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
ProcEnviron:
 LANG=fr_FR.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
SourcePackage: easytag
UpgradeStatus: No upgrade log present (probably fresh install)