Is there a hotkey to switch between split window panes?

Solution 1:

https://code.visualstudio.com/docs/customization/keybindings#_editorwindow-management

For Windows: Ctrl+1, Ctrl+2 and Ctrl+3.

For Mac: Cmd+1, Cmd+2 and Cmd+3.

There is no circular switch between panes, similar to what Ctrl+tabs does for files, though.

Solution 2:

If you're used to working in vim (and/or tmux) and want to move around with ctrl+hjkl

add these to keybindings.json

[
    {
        "key": "ctrl+h",
        "command": "workbench.action.navigateLeft"
    },
    {
        "key": "ctrl+l",
        "command": "workbench.action.navigateRight"
    },
    {
        "key": "ctrl+k",
        "command": "workbench.action.navigateUp"
    },
    {
        "key": "ctrl+j",
        "command": "workbench.action.navigateDown"
    }
]