Just installed the latest update. It looks well and works fine. I noticed one little thing : some extensions do not work anymore. Todo.txt and the drop down terminal.

    That's normal for basically any GNOME Stack upgrade, there are always going to be extensions that break. You'll need to reach out to those developers and ask for support for GNOME 3.36.

    Thanks for your answer. Now it's clear to me. Thank you very much.
    <SOLVED>

    evert If you need a drop down terminal, I recommend checking out guake.

    It's a drop down terminal that's available in the repos. To have it always accessible, you can set it to start on system startup in GNOME tweaks.