Can't choose the variable type when creating a variable in Bolt

Greetings,

On my very first try at attempting to use Bolt and following the YouTube “Getting Started with Bolt in Unity (Tutorial)”, the variable type with drop down, but when I move the mouse over the dropped down window to select the type, it rapidly flashes, won’t allow me to click on the type and then crashes Unity. Unity ver. 2020.3.7f1, Ubuntu 20.04 LTS. This is a new project with nothing done, only installing Bolt and the Bolt Platform Tutorial.

Use Unity 2021.1.7f1, wich has VS integrated with the editor.