On some small screens, if too many tabs opened, these icons occupy too much space. Is it possible to make them disappear?

Thank you for your help!
You can change GitLens' menu/toolbar contributions via the GitLens interactive settings editor from the command palette run GitLens: Open Settings

Hope that helps!
First button of the area marked in red rectangle by op is still visible after disabling "Add commands to the editor group toolbar"
@exse2 The first button is _Open Changes_ and is part of VS Code itself, not GitLens.
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Most helpful comment
You can change GitLens' menu/toolbar contributions via the GitLens interactive settings editor from the command palette run
GitLens: Open SettingsHope that helps!