It’s a known bug that needs to be fixed by the Visual Studio Code team.
Also see:
- Unresponsive IDE - #5 by pfeerick
- Can't enter text PIO Home Search fields - #2 by pfeerick
- I cannot create a new Project - #3 by pfeerick
- Cannot copy and paste examples in VS Code + Mac - #6 by pfeerick
As a workaround, double-click the PIO home tab.