Unable to edit mainAxisAlignment via Details Tree in Flutter inspector

Hi I am trying to edit the main axis alignment via details tree in Flutter inspector.

I am trying to complete an exercise in Flutter for Dummies which indicates that I can edit the property’s of a widget via the details tree in Flutter explorer.

it shows a picture of the pointer hovering over the mainAxisAlignment property and a list of available options but on my IDE when pointer over the same property I do not get the same drop down list of options.

any pointers would be greatly appreciated

Tuff crowd!!
$20 for the first correct answer