Full screen mode works fine in any other app, but in Chrome the tabs are not being displayed in the new Hera update
Update: I realized that is also happening in other apps like the AppCenter, where the header bar is missing in full screen mode.
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There are two options to go into fullscreen mode.
If you use F11 you go into fullscreen mode without tabs with almost any app.
The other option has tabs, but in order to achieve it you have to configure a shortcut via
System Settings > Keyboard > Shortcuts > Windows > Toggle Fullscreen mode
Click with the mouse over Disabled (if you have not configured one already) and choose a keyboard shortcut.
Personally I use Super + f because it is more intuitive for me to be like this but to achieve this you have to loose the Picture in picture mode, something usefull, which I almost never use, but of course you can choose any key combination you want.