Hi. I registered in this forum a couple of weeks ago, precisely to record that I have been using the unofficial Linux version of Scrivener for years. I wish the developers would give Linux a chance again. Linux is a free (freedom) operating system that many professionals from various fields use every day to free ourselves from the abusive policies of Microsoft and Apple.
I can’t help you much because, as I already said, I decided to settle for the unofficial version of eight years ago (how long!). There are some basic tweaks for fonts and such, but I don’t know how much of a native look and feel can be achieved, especially in GTK environments (if it’s the case).
The best option, as long as version 3 is strictly necessary and you have a powerful computer, is to install a virtual machine with Windows 10. There are many programs to do it. One of the most famous in Virtualbox. You can, for example, activate the license and then take it off the internet to ensure that Windows doesn’t spy on you. Its aggressive telemetry even damages hard drives.
You can also use the unofficial version. It is quite stable and feature-rich despite its age. Let’s see if the developers fulfill our wish and we can update our Scrivener. @AmberV (a developer) offered an explanation of what happened years ago and opened up the (still remote) possibility of making it happen:
Regards.