First, disable multible tabs: Set
Workbench > Editor: Show Tabsto single
Included in VS Code:
Control+Tab: Next FileShift+Control+Tab: Previous File
Custom, add the code in keybindings.json to VS Code (Shift+Command+P, select Preferences: Open Keybord Shortcuts (JSON))
Option+Tab: Next Workspace (file picker)Shift+Option+Tab: Previous Workspace (file picker)