The key binding of the IDE is usually in its settings. Make sure to restart your IDE after changing the settings for them to take effect.
* You can edit the keybindings.json file directly. On the keyboard binding GUI see:
The relevant commands are now "editor.action.inlineSuggest.*"
Also, change "tabnine.tab-override" to make sure that if you have both a popup suggestion and an inline suggestion and you press "tab", it'll accept the popup instead of the inline.