You can see your GNOME version in Settings → About. It’s a little fuzzy with Ubuntu though because they have a habit of shipping a mixture of packages from different versions.
It should be there once you’ve installed it. Alternatively, you can run it in a terminal as gnome-tweaks.
Do you know if GNOME 45 is shipped with Ubuntu 24?
If not, do you know how I can easily get the last version with a distribution, to avoid asking for already-resolved issues?
OK, I just found it. I didn’t check the Utility folder.
Thank you very much.
I hope you have (planned to) add all the useful settings to “Settings”, so that we’ll never need this additional app.