@Kaled I’m guessing you have the wrong expectations for open tabs to sync? Are you thinking they should automatically open? If so, that’s wrong. The way open tabs sync is that you’ll have a small section that shows Open Tabs that you can access. For example, from Desktop, you have Tabs from other devices in your History
On Android you hit your hamburger menu and you should see a similar option there. I don’t feel like hunting for my old Android to look, but I can say it was in the hamburger menu (three dot menu) rather than History last I looked.
Not all settings are synced. In fact, quite a few aren’t. This is especially true between Mobile and Desktop as they are quite different from each other.
What types of things are you thinking would be synced?
Just to note, the primary things Sync is all about is just History, Passwords, and Bookmarks. Open Tabs falls along with History overall. Everything else gets iffy at best.