ctrl+shift+p
Preferences: Open Keyboard Shortcuts (JSON)

[
    // ...
    {
        "key": "ctrl+tab",
        "command": "workbench.action.nextEditor"
    },
    {
        "key": "ctrl+shift+tab",
        "command": "workbench.action.previousEditor"
    }
]

Open file in new editor
File -> Preferences -> Settings [ctrl+,]

workbench.editor.enablePreview
workbench.editor.enablePreviewFromQuickOpen